Forum:Grimm Reaper's Grim Reaper?

I just watched How I Wet Your Mother and when they were falling on the skiing scene the Grimm Reaper said he couldn't die, then a bigger, meaner Grim reaper(?) appeared ann roared him away.

Does it exists?(in any kind of mythisism I mean) or was it just out of Billy Kimball/Ian Maxtone's imaginaion?