Lecters got superhuman abilities in the book. Amazing sense of smell, power over animals among other things. The bleeding he was referring too was her cut and nothing else I'm assuming.

I'm pretty sure Blair killed himself and the Thing assimilated his corpse to be honest. Blaire is acting differently than normal, which despite the fact he would have been doped up some, he had a complete breakdown a few scenes earlier and was doing everything he could to make sure no one could escape.

The last thing he says when we see him after they isolate him in the shack is "Watch Clark". Despite being doped up to keep him calm, you can still see he's dead serious and terrified. Next time we see him, he isn't terrified and just appears a little crazy. But the issue the brief conversation he has.

He wants to come back in and is suddenly big on self preservation. It's Brimley's last scene with any dialogue, but its incredibly telling because Blair knew everyone had to die, and was setting everyone up to die for the greater good. The Blair they speak to in the shack later, basically wants to save himself.

I believe it was the thing purposely playing everything off to make him look crazy to keep the others from bothering it while it was attempting to make itself an escape ship just in case it couldn't win.

We never knew if the Thing was able to communicate with other portions to itself, but considering Palmer and Norris were already infected I always assumed it was communicating with itself and one party was working on the escape ship, and the other party was working on keeping the remaining humans paranoid and scared while trying to assimilate them.

Just a theory of mine.