[part of him may have wanted taako to use whatever magic, because he's talked about it a lot, but cassian's seen very little of it. if anything, the easy admission of killing the guy makes cassian feel better about his decision to Avoid Situations.]

[he does not look back at jyn when she comes over, just opens the door enough to finally let taako inside.] Just one, with a delivery.

Unless your ghost friend decides to come back. He seemed a little pressed about the apparent murder.