You arrive at the stadium to see that it's pretty empty and starting to get dark. The parking lot only had a few cars in it. Probably from security and janitorial staff.

There might not be anything here... but then, there might.  Nonstop went sniffing around, literally, seeing if he could find any signs of the mysterious being.

There was am odd scent here, it wasn't human, but you can't place it, It's unlike anything you've encountered before.

That was promising!  He went to see if he could follow the scent to its source.  Animal powers were great for this kind of thing!

The trail leads you to a fairly large hole in the ground near the stadium.

Curiouser and curiouser.  He went down into the hole, of course.