Primary cause of T5 Divebomb failures

[SulwynCaliope]

Place a waymark in the pit, right against the outer edge, tell them to stack inside it. Works like a charm.

It doesn't actually. I tried teaching a friend T5 the other day and even with a waymark in the pit, none of them could figure out where to stand. I repeated SEVERAL TIMES for the ranged to not move out of the pit until they see the divebomb marker or hear the sound (with appropriate instructions to melee to restack just before second dbs would pop) and then to run out and back in when they do. If they magically managed to survive first divebombs, they'd end up spreading around and get smacked around by second set of DBs.

Waymarkers doesn't help people who are unwilling to even listen in the first place.