I get that he thought that he needed the crystal to save her, but…
The way I saw the scene, when the room started to shake, for one second he was paralyzed, torn between which to reach for. One hand toward the box, one hand toward the crystal, glancing back and forth, a moment of agony … and then he dove for the crystal.
It’s the same choice he always makes of course. He always regrets it, and deeply, but always a second too late.
He always acquires the power as a way to keep his loved ones. But holding onto the power is always the reason he looses them.
SFG
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Keeper of Anna’s Awkward Babbling and Kristoff’s Fur-trimmed Tunic!