The sword sank into the dragon's back. Had it been Falchion, that might have been it; the death may have been instantaneous. The dragon was mortally wounded, but took a second to die. It reared back with a mighty scream, trying to throw Chrom off its back with a hard shove -- and then it crashed down, depleted and done for. It the ground without ceremony.

A wave of dust rolled away from it, shielding whether Chrom was thrown or not from Robin's view. She stared at it for a moment, before she called out:

"Chrom! Are you all right?"