system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] Could I kill a weeping angel by breaking it when it is "frozen"?
gpt
When an Angel is being viewed, it is "quantum locked". They're essentially wrapped in a stasis field, meaning they do not experience the flow of time, and are therefore removed from this universe's cause and effect loop. They're essentially invulnerable in this condition.

The Angels aren't "stone" when they're frozen, that's just the closest description the human mind has for what a quantum-locked object seems to be. The Angels are no more prone to shattering than a photon of light trapped in the gravity well of a black hole.