He knows what bows are, because like every Astartes worth his geneseed, he studies military history like it's a second job. "We no longer use such weaponry but I have seen them. They are effective against demons?" Then maybe when he gets back he's going to start a revival.

Uh oh. Emotional circumstances. Exactly what Gadriel cannot do. "I understand. I lost my brother. We had fought beside each other for twenty years. He is gone, and I...was not by his side. I did not even have time to mourn his death." Don't mind him he's just going to stare off into the distance for a minute. "We honor our lost by keeping their memory as a sacred duty. So long as we live, we keep a part of them alive."

....an attempt at humaning was made.