For those that say F/P can't hunt firebrands

If they weren't fire immune, it'd make more sense just to kill them off and let new ones be poisoned than to switch to a new channel.

The first form isn't fire immune. You'd have to kill the first form before the second form spawns. If you change all the first form to second form (in other words, kill off the first form), then there's only second forms flying around.

What the TS appears to be doing is sticking around for 40 seconds for the poison to bring HP down to 1, and that's wasting time.

Once you change all of the first forms to second forms and poison them in the first channel, it'd make sense to go to a new channel while the second forms in the first channel are still being poisoned, so that you can kill the fresh first forms in the second channel.

After doing changing the first forms to second forms in the second channel and poisoning the second forms, you'd then go back to first channel. The second forms in the first channel should be in the same spot as you left them, since for some reason, monsters don't move if you're not in the map. It'd be pretty easy to go to a mob of them, kill them off with your 1 damage explosion, and then kill off fresh first forms that spawn after killing off all the second forms.

Actually, the size of that map would allow him to tri-channel if he didn't end up in the main room when he cc'd. If they weren't fire immune, using explosion in addition to poison mist would be more efficient.