Lower Lazy Boy Slide

Rode lazy boy - good ski conditions lower down, wind affected further into the alpine. Dug a pit near rollovers before entering upper bowl - ECTN and could not raise planar failure with a shovel pull. Skied two laps on the same slope on the way back down, no instability noted. Group following behind then triggered 1.5 on the same slope, with rapid propagation (start zone circled in image), appeared to step down. Short run out which the skier was able to escape. Another group following measured crown in start zone at 70cm (image). Otherwise no natural activity observed throughout the day, no cracks or whumphs.