He jumps when he senses you're right there and quickly turns around.

"I- Oh. Are you a new contestant? Did Airy send you?"

He does a quick inspection of you.

"Either way, um, hi! My name's Backpack, I'm helping Airy host ONE, and I hope we can be friends!"

He says with a smile. You may want him to keep it. Try not to get on his bad side.