Maul had been friends with Luke long enough now to be attuned to him in the Force. So when he felt the young Jedi sending out a mental distress call, he immediately dropped anything he was doing and raced out to find him. He sent a thought to Reaper down their bond. 'Think Luke might be in trouble. I'm going to find him.'

It didn't take him too long to track the Force signature down to its owner. When he found Luke, at first he thought he'd been attacked or he was experiencing one at the moment. "Are you alright? What--?" Then he realized the new ears and tail which had sprouted. Not just any ears. Puppy-dog ears.

He took in the sight. He knew this should have been a serious situation and that he should have been treating it with some gravitas. But gazing at Luke up and down, Maul eventually just broke down in a roar of laughter. He was laughing so hard he had to reach out a hand and lean up against a wall to keep himself upright. This was really just too much.