All good replies, one thing I think is missing is the panic factor. Our brains tend to race in panic situations, and the results aren't always good, wrist injuries are a perfect example of this. As Snowolf said, a board is more sensitive at higher speeds. With the board getting twitchy, your fast movements to try to get out of the situation (the tail coming out) can cause an edge catch as well. Don't even try going fast at this point, get the basic turning movements down first and get comfortable with the correct edge to edge work. Ride a mellow slope, stay out of really bumpy-choppy snow for now and just work on the basics.