He takes no chances with leaving a trail and evidence. At one point he pretty much disintegrates bodies so that a group can be seen as missing instead of dead, causing people to waste forces looking for dead people so those same forces don't look for him and his comrades. As of the raw, his classmates and the goddess still think he's dead. And he's most likely going to meet some of his classmates soon. Probably kill some of them to reduce the forces the goddess can mobilize.
He's the type to use his head a lot because his skills require tactical thinking.