What a dumb alien
First off, the fact that he is unfamiliar with water is laughable. This is from a species that probably has superior technology over Earth, yet apparently they have no concept of liquids since this dog-faced buffoon nearly got himself drowned trying to catch swans.
Second, what a pointless mission! Kaytor already killed and ate humans before meeting the lesbian couple, so his whole "infiltration" of them seems to be useless.
In either case......a fascinating piece of British B shlock!