@Kabensaal, what we have here is a classic notion of applying OOC information to IC scenarios.
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This does not whatsoever indicate that the bouncer's weakness is being lifted off the ground. Sure, he said that he heals, but he didn't say how he heals. He didn't even say his name, so on the off chance that Antaeus exists in the RWBYverse, and Mokuren knows about it, she still wouldn't know to apply that to this guy in this instance. Setting up a situation for Guess to reply to rather than autohitting him was a good move, but even planning to exploit the bouncer's (unknown) weakness counts as metagaming.
I never said that she knew he had the whole ground pound thingy. Pinning an immortal to an object is the best way to deal with them, and as stated, it is always better to have them off the ground so they can't get any leverage with their feet, and have to flail rather than having a sturdy base. There was no knowledge or exploitation of a weakness, simply logic. The fact that said logic happens to exploit the weakness is just a coincidence.