Driven momentarily speechless from indignation and horror that his relationship with Drake was so easily figured out, Sanzo didn't have a snappy retort to Cassian. The look he gave the other priest was meant to be murderous but was more offended than anything. Of all the people to know who he was, somehow, involved with!

"If I see you again, it'll be to fucking kill you," he finally spat out, all sorts of offended right now.