Is this threat illegal?

For those in the U. S.

A racist man is following another man around using slurs and hate speech repeatedly. The other man is ignoring it and leaving the situation, so the racist man blocks the other man's path and pushes him back into the crowd of onlookers. The other man says "say anything you want I don't care. But if you touch me again I'll kill you." The racist man goes on to say that the threat is on camera and that the other man is going to jail. Do you think that threat is enough to get the second man in legal trouble?
Is this threat illegal?
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