The Angel tensed slightly and graced himself for the inevitable, he could have stopped Dean's arm in it's tracks with some effort but instead he simply allowed the knife to slam straight into his chest. He didn't wince or even blink but continued to stare intensely at Dean before slowly lifting his right hand and grasping the knife's handle he pulled it free, blood began to stain his white shirt and trenchcoat but it didn't seem to affect him at all.
"I would advise against trying to kill someone intending on helping you escape this tomb, Dean"
Turning the knife around so the handle was facing Dean and the blade balanced between his fingers he continued to stare with an expressionless blank look to his face, the faint light illuminating the door hit his sharp blue eyes and his slightly unshaven jaw.