Something I noticed is that you can collide with other characters, so if you have three other friends, you can effectively isolated people by collaborating and standing around them, and there is no escape but to reload the page.
If you get surrounded by four people, a textbox appears saying that you can press <space> to teleport out. A larger group of people could form a ring to entrap people, but that's harder to coordinate.
Something I noticed is that you can collide with other characters, so if you have three other friends, you can effectively isolated people by collaborating and standing around them, and there is no escape but to reload the page.