Desmond learns he's back on the island, attacks Widmore

Desmond wakes up in the infirmary on Hydra Island to see Zoe standing over him. Desmond is disoriented, but demands to see Penny. Charles Widmore enters and tells him that Penny and his son Charlie are safe, but he can't see them because he has brought him back to the island.

Upon learning this, you can see rage building inside Desmond who then attacks Charles Widmore with his IV. Charles' head is cut and he leaves the room.