This is, of course, an extreme option, but not the only one.
I don't know if it's possible to escape to the port, probably, but other enemy units might be waiting there.
There are "our" units with ranged weapons in the city, which Kirov will most likely be wary of. This is the best option, but it's very slow. That's why I'm still in favor of air shields and tanking with Guion. We gain an advantage in defense and either defeat him with ranged units (if we're very lucky, I must say), or force him to retreat. Or, indeed, we successfully retreat under the cover of air shields (but not without them, hoping that there won't be any trouble - there definitely will be trouble. If he has ranged weapons, his range is the same as ours, 15, if not more, plus his movement speed). I simply don't believe in an infinite supply of bombs because even bullets and arrows are finite./
/ For now, Melen can relatively safely retreat to the port, of course./