I vaguely remember someone posting about a problem like this in the original Mask of Arcadius release announcement thread, but the in Claude's recruitment mission do not act whatsoever, at least on Captain difficulty.
EDIT: Actually, now that I reload and check, none of the enemy units act anymore whatsoever no matter what difficulty is set, not even the remaining Pirate Cruiser, Ryder, and Cosette. Might it have something to do with ?
http://steamcommunity.com/app/313730/discussions/0/616189742915659860/?tscn=1412667033#p3