Originally Posted by psuman99
Your logic is flawed here.
The amount of combo points consumed doesn't really matter since our rotation is based on only using FB when you don't need the combo points to apply Rip or refresh SR. There is an opportunity cost in NOT using those combo points for a FB in that situation. Since FB does more damage per energy than shred or mangle, it is worth using for the initial 35 energy. However, wasting the additional 35 energy to not build combo points can lead to Rip falling off the target or SR dropping off, each of which is a large dps loss compared to the extra damage that additional 35 energy did vs. using it for a shred and 1-2 combo points. Now obviously, if you KNOW you can use that extra 35 energy and still maintain your bleeds and SR, it will be a dps increase but to say that across the board it is always worth it to use that extra 35 energy is an inaccurate statement.
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Your argument has merit, but let us look a little more closely.
Suppose you are short on combo points such that using FB at 70 energy means delaying your next rip by 35 energy, perhaps 2.7 seconds with haste. In this case you lose 2.7/22(rip damage) and gain roughly (FB damage)+(-35+2.7/22*30)(shred damage)/40. (Gain a ferocious bite, lose 35 energy worth of shreds, and gain 2.7/22 of rip's energy worth of shreds.)
I'm not sure of the precise comparison between rip, FB, and shred damage in 4.0.1. But suppose that rip does 3.5 and shred does 0.7 times as much damage as ferocious bite. The former is based on the figures a page back, including mastery (base plus about 4 points) and glyph; the latter is based on 3.3.5 values. (If anyone has better values let me know - I'm not able to download 4.0.1 at present.) In this case the net gain is about 0.02 (FB damage) - essentially break even. So even now we're not losing damage.
Note, however, that this assumes it is certain that spending an additional 35 energy will delay rip by the equivalent amount of time. In reality, the time to generate 5 CP follows a fairly broad probability distribution. In most cases, it is far from certain that rip will be delayed by the full 2.7 seconds; and if you did set up a case where this was near certain, you would also expect to lose a lot of rip uptime just due to the base FB cost.
Let me make this more precise. As a rough estimate, the time to generate 5 CP looks something like
where h is the haste, l is the clearcast rate, and c is the crit rate. I assumed for simplicity that each CP generator costs 38 energy. I've also ignored tiger's fury and berserk - let's say they are on cooldown. Let me assume 40% crit, as kalbear suggested, and 30% haste (as above). If it hasn't changed in 4.0.1, we expect a clearcast rate of 3.5/60. Note the standard deviations in the mean clearcast and crit rates are
where n is the number of CP generators used and m is the number of autoattacks. Strictly speaking m and n depend on the values of c and l, but since this is just a rough approximation I will assume they are constant. It takes approximately n = 5/1.4 = 3.6 CP generators to generate 5 CP and approximately m = 5/(1.4*(10/38+3.5/60)) = 11.1 autoattacks are made (I will ignore fury swipes for simplicity). Hence

and

.
Now t = 8.54 seconds from above and its standard deviation is
[Remark: If someone else, perhaps someone trained in statistics, could come up with a better estimate for the probability distribution of the time to generate 5 CP, this is certainly something that would be of great use in general to non-simulation feral theorycraft.]
What does this mean? Suppose we have 35 energy and rip has 8.54 seconds remaining, so we expect to generate 5 CP in rip's remaining duration.
First, let us FB now. The expected amount of lost rip uptime is approximately
Next, let us try using FB at 70 energy. In this case the expected loss of rip uptime is approximately
Here, using FB at 70 energy is only costing us an additional 1.9 seconds of rip uptime; this is a moderate damage gain (about 13% of ferocious bite's damage) according to the initial analysis.