Yeah, I saw that, and I did look into it and review Octane's code.
I could not find anything in the mana ticks or the spellsurge buff gain events that indicated whose they were. Octane is using an Ace library that seems to provide this information, but a) I am not 100% sure how it does this, and b) I suspect that it is maybe saying they are "your" ticks merely because the spellsurge tick event is CHAT_MSG_SPELL_PERIODIC_SELF_BUFFS, which implies that the ticks are from the player, when I suspect they could come from others using the same event.
Long story short: my heuristic is pretty good, and I can't improve it until I find someone else with Spellsurge who wants to test with me.
