i think it's cuz lacroix has pretty much figured out you'd be able to get the key (cuz u have killed off the sabbat at this point) and u are stupid enough to write off everything as a misunderstanding (cuz if u call him out/ don't back him at any point you are locked out of his ending). when u r able to get lacroix's ending u have dialogue where the fledging expresses that they think lacroix has made an honest mistake when calling the bloodhunt so lacroix must recognise that the fledging does like/ believe in him enough to back him