my instinct, from hard experiance, is being on the floor is a bad idea, if i end up there its a mistake and one that should quickly be rectified, maintain mobility at all costs. I could certainly take the opportunity to punch him from a kneeling position, but there's not stopping power. In the punch from that position, and his hands are likely in the way, mess up his nose perhaps, but id be better punching th groin if I've got a choice.. So punch , stand up and kick or just stand up and kick, the kicks the man stopper, , so the sooner the better.
you could certainly find your body position is less than idea for a kick, but the very skill of the soccer kick is adjusting your body position quickly so you can deliver, it matters not if the first kick lays him out, as long as its hard enough to knock the wind out of him, you then have plenty of time to deliver any num.e r of kicks from any position you choose,,
he is on the floor I'm stood up, that is not going to be allowed to change