Me? I just like to see Barty lose his temper. If I can cast doubt as to whether it's really him, as well, so much the better.

And sure, if he starts to think perhaps Bella or Malfoy or any of the others had a hand in making him out to be dead, better still.

Mostly it's just a distraction. Two days before the full moon and Remus can be - tetchy. (Especially as he's a bit worried about Dora being next on the hit list behind Barty and his mum.)