How does an alien disappear without a working warp drive?

I've just managed in a feat of spectacular stupidity to lose six
modules to a Weasel (95). The damn thing blessed his cloaks (which I'd
stupidly not thought he'd do) and so got a tad to close for comfort
and by the time I'd widened range safely enough I'd reached my retreat
threashold of 6 and so (even more stupidly) ran away. So far my fault.

However what I don't understand is where said Weasel is now. I didn't
jump, and I'd shot off his warp drive*, but he's not here any more. I
want a chance to reclaim my modules :-( . (ok they were lousy
modules anyway but I wanted to claim his as they were worth a tad
more)

Marvin
Fiercely Paranoid captain of the Lost Hope.

(ok not so Fierce it seems for a bit, but pretty paranoid that
someone's pinched my weasel)

*Yes ok so this as it turns out, was stupid too, but I wanted him to
hang around for a bit, and hadn't considered removing his weapons.