Its easy to make judgements when you've been forwarned of whats coming up, but some times things happen so quickly its hard to react. I had almost the exact same thing happen to me before. Friend and my self were racing each other to make it to a small inlet first, a third friend was ahead of us and made a left turn with out looking, which ended up as a three way collision. We all hit pretty hard and luckily no one was hurt but there was significant ski, and ego damage, and rightfully, we all felt pretty dumb.