>>2149But he can reach her, if he leaves the cage. It's clearly shown he can physically make it through the bars with his swipe around this point. But he can't.
The increased emotional display of both rage and sadness when she's outside the cage shows that he's likely afraid to leave.
His breakdown at the end in that context shows he's afraid of her leaving.
She seems more curious than malicious though. Why does he want to interact? Why won't he leave the cage?
Addiction fits well. Leaving that cage is leaving a comfort zone. One of many barriers you try to set up and never cross. Outside of that, you never know if you can keep it up.