If you don’t want a motion to be debated or passed at a meeting, is it right to walk out of a meeting so that it no longer has quorum? I would generally say no, but on the other hand, is it right that turning up to vote “no” may actually lead to the motion being passed (cf. the monotonicity criterion - voting against something should not make it more likely to occur)?
There is no ‘wrong’.
There is simply ‘allowed’ and ‘not allowed’.
In which case the silly bugger who drafts the quorum (and I have never seen a quorum which was not silly, at least in terms of results) is entirely to blame for his own short-sightedness.