No clipping monsters?

[Bashe]

I was having fun in DeHackEd making all the monster's speed 50, but when I play the game, I get some strange effects. Like in level 13, the Revenants on the building can come down and the zombiemen in level 1 can go through walls. Why are they doing this?

[Ichor]

They are moving so fast that they can pass through walls sometimes. If you really want to increase their speed, just raise their speed a little, then go reduce the frame duration of all of their walking frames.