Had a friend fall on a mixed climb....had only a 10cm with a Screamer attached...total length of fall was 15-20 feet...Screamer activated to it's fullest length...10 cm held the fall with the friend upside down looking his belayer in the eyes...so yeah, in good ice they do work..
I place mostly 13's and when I'm worried about bottoming out a screw I'll sink a 10. but yeah mostly just don't fall leading ice. It's not so much that I'm worried about screws pulling, I'm worried about breaking my ankles/putting a tool through my femoral artery.
Yeah I hear ya...some 25 yrs ago one of my buds broke his ankle when he fell top roping a WI climb when one of his crampon points snagged as he fell. Not good!
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