Incarnation is not your main worry is Berserk (reduce cat ability cost by 50%) which lasts 15 sec. While incarnation lasts 30sec the burst is all during those 15 sec .. the feral can macro it all together and she can try to bait you to pop all CC on Incarnation and then pop Berserk!
PS: The healing lasts 30sec Natures Vigil
On my feral i've gone up against teams that completely negate my burst by using smart CC and LOS .. Remember you want to mitigate as much of the 15sec as possible.