Triggered a slab while riding between two of the main chutes in the trees, near the top of the line. Was unexpected but luckily had picked out a safe zone prior to dropping in and made it there before the slab went and ripped the snowpack out of the run. Crown was about 120cm deep at trigger point (sheltered opening in the trees, fairly low angle), propagated about 100m with varying depth between 120cm and roughly 30cm, going to rock in some spots. Did not affect the main chute features, but just about everything between two of the chutes has slid.