maybe a beam hits them or a missile or something
so basically I want them to feel all good and fluffy about the plant people
then wham, they half-wake up, but everything is dark, they are in these rather tight, humid pods
they'll probably try to break out of them, which is not too difficult, since they are "ripe"
and they see other people come out of the pods, with blank looks on their faces and pale skin, vines still clinging to them
several plant people investigate them, but find no problem with them
one of them will announce that a scouting drone fleet is approaching, if they hide the drone may not notice them, if they don't the ent starts fighting the drone
and when they regain their bearings, they see that they are on a small floating island with some large, root-like wings out the sides
speeding towards this small archipelago of islands, the largest one with a small fortress on it
the plant people expect them to be fully brainwashed, so they're technically allied, but once the islands clash there'll be a bit of a melee
some organic siege weapons will start firing, like spores and fumes
the Knights will try to hold them back
again, I'm curious if the PCs will come to their senses and join the "right" side
if they don't, and they pass out, they end up in a laboratory where they'll have to clear things up