Swarms are immune to forced movement from melee and ranged powers, so swarm 1 stays put. I'll allow the MBA though.
With 3 swarms adjacent, Lenyara will take 3+2+2=7 damage at the start of her turn, not (3+2+2)x3=21, which would be a little ridiculous, hehe.
EDIT: Scuttler 2 does get thrown...