I just defeated Ansur with Wyll in my party, and the dialog with him is odd. I've searched to see if anyone had this problem, but only find posts about Will saying to go back to camp and talk to his father after defeating Ansur when his father isn't at camp.

For me it's different, there's a long, awkward pause then everyone does that squint and hold their head thing like the Emperor is talking to them through the worm, but there is no dialog. Then Wyll says a couple of things, and then the Emperor says a few thing with pauses in between like I'm only getting half of a conversation.

Here's a video I recorded of it: