what state will the cluster go to be if a slot migration interrupt and can't recovery?

the interrupt cause maybe:
a) the machine of initiate the slot migration damaged before done and after move some keys in the slot.
b) the source or target cluster node shutdown accidentally.

questions:

1. what state will the cluster go to if a slot migration interrupt and can't recovery?
2. will some keys of the slot lost?
3. will the slot exist in the two cluster nodes at the same time?