Lester doesn't notice the shotgun until the guy points it out, at which point he's already grinning to himself and thinking about how he's gonna get it from him.

He shifts closer to Beelzemon like he's totally into the idea of whatever story time they're about to have with each other. "Bullseye. What do I call you, handsome?" It's worth a shot. Doesn't look like a being that people might find handsome, so maybe it'll work out?

And if he's making heavy eye contact it's to distract from the hand that's reaching slowly toward that sawed-off.