Thrash: If you’re attacking more than one target you generally want to keep this up all the time. The more targets, the more important it is, so when you're fighting a large number of targets this should be your top priority after Savage Roar. Thrash has a Pandemic threshold of 4.5 seconds, so refresh it as soon as its remaining duration reaches that threshold.
In Warlords of Draenor, using Thrash on a single target is no longer a significant gain. At level 90 it is a small gain due to the higher levels of mastery available with Siege of Orgrimmar, but at level 100 the gain becomes of no significance and is not worth bothering with. In both cases, if there are secondary or tertiary targets who are useful to damage but not a priority Thrash can be maintained with little to no damage loss to the primary target.
The Fluid Druid - View topic - Pawkets' Feral DPS Guide & FAQ -- Updated for 6.0!
Also i would not read anything that Alaron posts. He is slow and retarded. Pawkets, Tindehoof, raffy, edgy... These are theorycrafters, Alaron is just a faggot.
upd: Handnavi, is it possible to investigate Prowl out of combat? It does not seem to work. Also, how difficult would it be to add to Pull Behaviour pull with Faeire Fire?