Hmm, I've never seen someone who would be fast at typing yet not being able to touch type.
You guys have to define “fast”. After all, speed is relative. :)
fast: you know it when you see it.
I could hit triple digits WPM without knowing how to touch type. I just learned adhoc how to type very fast from gaming as a teenager. I haven since learned how to touch type (and moved to a split keyboard with Colemak-DH) and I type at a pretty similar WPM, it's just more comfortable.