Buffy’s been snacking on other spiders it looks like. Not sure what the story behind this was. They don’t generally get territorial unless it’s a question of food, and Buffy just ate three days ago. Hm. No idea.
It’s hard to tell, but if you look, Buffy’s legs match up where his body ends. The roundish bit above that is the body of the other spider, not part of Buffy.