Saw this avalanche while touring up around Guardsmans Pass. We ascended the ridge an hour earlier and the slope had not slid yet. Came back up and noticed the debris pile at the bottom. Did not see anyone skiing this slope, but a party of 3 did ski near the trees lookers left of the avalanche right after we ascended the ridge the first time. I highly doubt it was a sympathetic trigger from that ski party, we would've seen or heard it if it was. Most likely slid naturally as the sun heated up the surface during the day. Did not go and investigate the crown because I did not trust the stability of the surrounding slopes.