Either the script or the third pet selection could be improved. If the enemy has a magic pet with Phase Punch, and is faster than your dragonkin, it will swap out your Dragon and bring in your Zoom before you can use Lift-Off. Theen thee script uses Slow and Steady which is inefficient against a magic pet and then it's not up for an undead pet if it comes in.
I was able to do this just fine with Ghastly Kid and then Alpine Chipmunk against the undead pets as I did not have Zoom leveled up. Used Scratch, Adrenaline Rush and Nut Barrage with the Alpine Chipmunk.