Cas flashed a rare smile, taking the ability to heal into account. There was much about being an angel that he did not miss. For instance, his siblings and their narrow-minded opinions concerning humanity. Admittedly, he still preferred to follow orders rather than give them, but he did not miss being told what to think or how to behave. Especially considering many of them had been of little faith to begin with. "That is very fortunate," he replied. "As it would turn out, the bite of a vampire stings as much as you would expect it to."
To illustrate, he held up his right arm, showing off the faint scar of two rows of teeth marks where a ravenous newborn had latched onto him. Acting as bait had been common for him while hunting with Dean, although it had largely been his fault. No one had been around to inform him that Dean always chose the scissors option.
The ability that Steve described sounded entirely familiar, and though Cas did not regard it sadly, there was a faint twinge of something indescribable that he chose to leave alone. Most emotions were dangerous and best avoided. Without a way of interpreting them, it only left him frustrated anyway. "Should we meet any angels outside of my wife's duplicate, you will be well-suited to facing them in battle. Your abilities sound similar, at least in terms of the accelerated healing and lack of fatigue. Though I will warn you that striking one directly will do very little damage. We would need to procure you a blade."
As much as Cas liked Steve, his own blade was the last connection to Heaven he had and he was still somewhat protective of it, as strange as it was. Objects had no meaning on their own. Considering he had little understanding of sentimentality, he refused to refer to it as such. "Thankfully each angel carries one, though I'm hopeful we do not encounter them to begin with. I feel the demons were sufficient enough."