Regarding the interrupts Alysrazor-10.

Did it without points in reverb. hte best way its to try interrupt near the end.
Dmg wise we can solo them but its best if you have a caster help you at least in the first spawn. I had a lock the dotting the first one so I could get to the second faster and never have 2 up at the same time.

Did this fight last night (10man) with 2/2 reverberation, and interrupting the spell early I still found myself not being able to interrupt *every* cast, this happened like twice when the add decided to cast Fieroblast again straight after the previous one despite me interrupting him, instead of Bushfire(?). That wasn't really an issue - dropping grounding totem on the rare cases when that happened solved it. This fight seems doable without 2/2 reverberation if you do the interrupts late and use your grounding totem as needed, damage wise we can was solo one side as mentioned previously in this thread.

I can confirm this behaviour on 25man as well (You can't stun them by the way).
Sometimes they seem to double cast it as in the second you interrupt with WS they start a new one.

I did notice that it only seems to happen if you instantly interrupt as they start their cast. I'd go as far and say that it's a bug.

What we did to counter this was that I had a back up interrupter. Normally you can take each cast even without 2/2 Reverb - if it started to cast after I interrupted a warrior took over.

Also for Phase 2 when she's on the ground: If you interrupt the channeling adds and let them come closer to the boss, you can position yourself and interrupt one all the time while still dpsing Alysrazor. Though you do need 2/2 reverb for it I'd say as they start channeling really fast again.

Can RB wep taunt Cinderweb Spinners down in Beth'tilac fight?

I've been running many sims on different gear and priority lists recently and I am finding SS > LL in all of my cases. I show this for 4pT11, 2pT11 + 2pT12, and 4pT12. I presume this is the case since if you have LL > SS you can wind up losing a lot of SS compared to SS > LL you don't lose as many LL.

For my current gear, my SS ppm will increase by 4.7% while LL ppm decreases by 2.2% with SS > LL. The dps from these abilities alone don't justify the change to SS > LL. I think that what is driving this is the increased ppm of a lot of our passive damage abilities like WF, FT and trinket procs plus the buff that SS has received. I am also seeing a ppm increase in ES (no reverberation) and UE. I presume this is due to having more free gcd space to execute lower priority abilities.

Edit:
With LL > SS, often times the cd of these abilities will synchronize SS to LL with latency modeled since they are only 2 seconds apart and the gcd is 1.5 seconds without haste effects so that by the time SS is coming off of cd so is LL. By making SS > LL you effectively reduce the frequency that these two abilities are coupled together thus freeing up space for the lower priority abilities (UE, ES).

As an example, this is the list I am currently using for max dps:
ST_0
SS
LL
FS_UEF
MW5_LB
UE
SW
MW4_LB
ES
MW3_LB
ST (<=5 ticks)
MW2_LB

200-400ms Reaction Time

EDIT: Didn't realize this was already changed in the OP. I never saw a discussion of this though so perhaps this post still has merit. (Doh!)

The eye of purification just dropped for me, and i didn't realize its dps and damage had been nerfed from what was last posted on MMO-Champion. Were the previous theorycrafting numbers based on its actual dps/damage of 275.9/463-861, or the reported dps equivalent to agi weapons?

db.mmo-champion gets a lot of weapon damage ranges wrong. Wowhead is a lot closer (it's only off by 1 on the upper damage range).
SimulationCraft's damage ranges match what the Armory and in-game says. So yes, our theorycrafting uses the lower damage range.

Weapon swapping actually costs less time, since you can swap in your weapon with Windfury on it while you're still waiting on the global cooldown from casting Unleash Elements, making it effectively cost you only 3 seconds. And considering you're waiting for the spiders to actually drop down, resetting the swing timer is rather moot.

I noticed this. I also noted that if you have multiple flame shocks up and UE a Fire Nova it buffs the dot damage on all targets hit by the nova.

I've been looking at your priority list for dps, and I've noticed that in this you don't list lava burst. Been doing some research to make sure I still play enhance properly but I'm seeing a lot of simulated dps charts where they use lava burst in their rotation while using the Eye of Purification drop. Is there any set data on this as I am finding it hard to find any.

How can you use same Unleash Flame buff for LvB and FS at the same time if its fade after using 1 spell?