( Lexi let's him loose, then brings his wrist to his own hand. he bites into his wrist and lets the blood start to flow.

but as he watches, the blood starts to raise off his skin. it pulls into the air and forms into a crystal hanging above his hand. ) I don't practice on others often. I have to kill anyone I practice on.

So, I'm more skilled at manipulating blood externally through practicing with my own blood.