User blog comment:Milesprower2/My Jurassic Marsh Part 2 Reaction/@comment-1764483-20151218203202/@comment-5792287-20151220104420

Yeah, I think I know why it happens too. The music changes can occur at almost any point in the level, and the music can therefore change to metal at any point in the level. When the music changes, at least one zombie that receives buffs from the new jam has to appear in that wave, meaning that early metal jam results in early Hair Metals. I've had a Hair Metal Garg as literally the second zombie in one level, and still survived. I'm actually enjoying this difficulty. Certainly not as bad as IB. Early Hair Metals I can handle. Stupidly early Weasel Hoarders, I cannot.

And I haven't seen a single Raptor in La Brainsa Tarpits yet, do they not show up?