It doesn't matter if the IP happened first. If there is more than one rules violation:
12.20.2
"Notes:
1. In determining the result of play, ignore the leaving early violation and apply the effects for any other rule violations in the order in which they occurred. That end result becomes the first option."
In your situation, the OC gets the option of the IP or the in the park HR. Whatever his/her decision is becomes the result of the play when giving the DC the option of the leave early or result of the play. Obviously, in your situation, the DC will take the leave early regardless of which option the OC chooses. The result would be no pitch, runner on first is out.
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