What frame would be the scariest to encounter as an enemy trash unit?

Put yourself in the shoes of a Scaldra Trooper with their squad. Say you manage to flee before the slaughter and you watch the whole thing- or maybe you stay in the formation, watching your friends die around you. Which frame would be the most trauma?

Some immediate thoughts-

Grendel; eating people

Ash, Loki; just your buds start bleeding from the neck one by one seemingly magically