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- Oct 3, 2008
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For that bit, as already said, his heart is gravely injured, not completely destroyed.
As for how he managed to open it:
Well, to summon a keyblade one needs a heart (exception, nobody of a keyblade wielder, but this doesn't apply here), so that means Ventus still had his badly maimed heart inside him at that point.
This is also not contradicted by Yen Sid, who just said his heart is "asleep" and it is as if the heart is gone. He doesn't say it as a fact.
If Yen Sid can actually sense if Ven's heart is injured and how severe it is, that is matter to speculation.
However back to the point with that door to light.
It happens just after Aqua contemplates where to take her comatose friend, and there I assume Ven, just for once mobilizing his last ounce of strength, actually summons the blade to show Aqua the way where he would like to rest.
Sometime later then, Ven already in his sleeping chamber, his heart finally succumbs and due to the severity of the injury must leave its body because it can't go on any longer. This great pain and sadness is then felt by Sora, who reaches out and then accepts the heart's plea to shelter it.
So, between the actual sustaining of that injury and the heart seeking refuge with Sora passes at least a bit of time.
So, his heart is gravely injured and didn't destroyed. Why does Yen Sid couldn't sense him?