Much like Lucifer, Gabriel knows the moment Raphael arrives. Less like him, he's content to wait a while for a network post, to try to figure out from a safe (ish) distance whether or not it'd be a good idea to approach. After waiting a while though (well, an hour or so -- what? he's impatient), the nerves get a little too much to take, and he pops up a few feet away from Raphael. It's not as if appearing much further away would be any safer, so he might as well make a show of trust. Or at least of not being scared.

"Come to join the party, have you?"