Why is Cassian being pointed at, he would really like to know. He said nothing when she blamed the chair for her current woes (beyond a slight shake of his head at Poe's question - he's a spy, he could pick these simple locks anyway) and only holds up his hands in the universal I'm unarmed gesture when she rounds on them.

Granted, said gesture is a straight up lie when taken literally, but he hasn't done anything!

"Do you want tea?" Is this an attempt to change the topic from things they aren't talking about to something safe?