Maybe a rockfall/landslide, but the chances of surviving such an event (if it's big enough to completely bury him) are slim, and, unlike snow, any sizeable rockfall is going to be hard to dig someone out from.
Don't get too many illutions about avalanches... the white fluffy stuff has little to do with what you find after an avalanche: Snow that is disturbed settles and becomes rock hard. Digging someone out from an avalanche is really hard work. Not as hard as digging someone out from a rockfall, but still plenty hard.
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