FMJ from a pistol doesn't deform very much. I shoot into dirt berms and pull out perfect bullets all the time. The video is entirely unsurprising to me.
The bullet was effectively stopped by the ice (minor ricochet). This is a conservation of momentum issue, with the momentum transferred to the ice. The spin is a conservation of angular momentum issue. There isn't much acting on the bullet to stop the spin, so it spins.
Not surprising at all.
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