That’s the strategy I’ve seen on quite a few raids lately. It makes you waste your bombs and orbs. Usually the enemy has simply stopped up the holes by placing stolen thralls from his own raids with a shamble of mismatched armors. It’s a good one too, imo, because if they sprinkle a non stand/guarding Berserker deep in there, with a name change, zerk can sometimes take out a weakened follower.
Yep, you’ve got it. Go to each placed thrall, make them follow, then immediately stop following. They will appear as “SCOUTING.”
For your test, try giving a fighter a ranged weapon in addition to his melee. Change his stance to whatever you like, with 5m distance for chase and pursuit. Then try to kite a large Purge beast very close to, and parallel to, a long outer wall.