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If a space marine is adjacent to a genestealer can the space marine back out or is he commited to fight hand to hand?

Treat it like a new game, not like a mod on 40k: nothing in the rules says that is the case, so no need to infer it.

It rarely occurs that you'll have a termie in melee but not dead, but, if you do, yeah, it can run away like normal (slowly)