Yep looks like Derek now has encountered Slender Man too.
I got to say, I’m really enjoying the sound effects for IMF's distortion. The way you could hear that almost heart beat sound on the build up to Slender Man's appearance, the way the sound went into a kind of humming like sound. It’s different, I like it. Simple effects but yet it still pulls off a brilliant touch.
Also like how instead of coughing or panic, Derek instead had trouble breathing from the sounds of it.
One final note is that I really enjoy how more casual everyone sounds in these videos, when conversation is struck up between the characters it doesn't feel like acting, it does feel more genuine.
All in all, a good entry and the Slender Shenanigans clearly start here.