The wound had soon healed, but that's not the point of the attack. Harker's blood was like liquid fire as it melted the ground and the ice underneath.
"Roland" moved fast to grab the hand once it was fully revealed, submerged in bloody water. The hand was very stiff, and wasn't attached to the body. It didn't grip the shard between its index and thumb tightly, but it was impossible to take it without breaking the hardened bones.
[Shard spotted! You have retrieved 3/13 of the Orb of Omniscience!]
As soon as he did take the Shard, the hand crumbled into nothing but ashes, reminding Harker of that old saying.
Harker knows that this must be Hanker possessing Roland. He most likely got into the ship through the 'gift' they provided to them. He felt so stupid, but there was no way to anticipate that he would change his mind about his suicide. And it was even more impossible to anticipate…..
