In a game last week this situation came up. I was running to the disc my defender came in from the side towards the disc. We collided hard enough to push me off the disc and neither one of us caught it. I felt I had better positioning on the disc and that the contact was more than incidental so I called a foul. He contested saying he was playing the disc not me. Fair enough, but I thought this would be covered under the rules covering catching fouls...
"A. A catching foul may be called when there is contact between
opposing players in the process of attempting a catch,
interception, or knock down. A certain amount of incidental
contact during or immediately after the catching attempt is
often unavoidable and is not a foul. "
So what gives, is any amount of contact allowed if both players are 'playing the disc'? Who has the ownus to let up on what is concievably a dangerous play? My gut reason for calling the foul is that this is a non-contact sport, and that was a solid hit (believe me I used to play rugby).