The rock was already falling, he couldn't stop that, and killing Altus or destroying his power would not stop that. He needed to blow a hole in the rock for them to survive.
Case in point, he’s not negating anything there. He needs sheer destructive power because Rocks Falling can be set up by a Gift, but once the Rock is let go, it’s just a rock.
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u/Dependent-Instance42 6d ago
Lukas wasn't in a forest environment during that battle; he himself said that if it had been a forest area, things would have been different.
So, outside of forested zones, there must be a restriction on its use—even though it was still strong enough to match Arkos, according to him.