Strumming with a Flat Pick

This is a 4.24 minute video response from Brad Henecke on Nov 1st, 2008

Question:

"JeFrank asks "I'm finding strumming with a flat pick more difficult than meets the eye. I can strum down fine, but I find that when I strum up, I catch the strings in a very jagged way. Any tips about that? Also, how much of the pick should emerge from your fingers? Does your hand angle at all as it goes up and down? Thanks!""