The hole is enough and he's gauging the size. It's enough to fit through himself but he's not leaving without Joker. Or at least not until he makes some stupid decision he cannot counter. You can't save everyone and that was a firm belief he had. It makes him frown to see everyone still standing around. He's not entirely unaware of the situation going on, his ear still bent back to listen to their conversation but his hearing isn't that that good.

Steven was an odd case. He hadn't been bad to talk with at the party nor did he really stand out as one of those kinds of kids. He just knows that Joker isn't going to leave without him unless there was a good reason. He looks back towards the others, his fingers pointing towards the hole with an almost demanding stare. Get. The Hell. In the Hole.

Except he's looking at Gon and reminding himself that Zangetsu likes this one. Now to weigh whether he cares or not to make it wider given he's over there talking to Steven like an idiot instead of staying out of the way like Joker has insisted.