Then Let Me See Him

When Robin hallucinates that Slade has returned to kill him, Raven tries to use her Empathic powers to reassure Robin. She shares his vision to show him that no one is there, only to find that Slade is real to Robin, and that being real to Robin means the hallucination of Slade is capable of doing real damage to Robin.

Example of:
Seeing Through Another's Eyes