Jaskier will agree he's more inclined to think something has happened to her because she hasn't returned for payment after the performance. He'll start on an anecdote on how a fellow jealous bard once tried to push him out a window. Not that he thinks Umber was pushed out of a window, but if someone compromised Retha's lover on purpose, it isn't impossible the same happened to Umber.

He'll ask if there is a place that Umber would have used as a dressing room, or if she had any other close friends among the performers. Is there a reason multiple performers would try to be the Drowned Maiden?

Additionally, since Jaskier's magic is centered around birds (illusionary and otherwise), would he get any strange feelings from Firewing itself?