I think you should learn be proud "parents" of your additions to your happy little home. There's the beginnings of seeds forming(notice the split right below the base of the hairs) Someone correct me if I am wrong, but the damage is already done. lol
Like another member said, don't "cull" it just yet. Let it grow, watch what it does, and learn from the experience. You need to check all your plants. You might have stray pollen. spray your flowers lightly with water to kill any "live" pollen left on the flowers. It won't hurt the rest of the grow if you can find the culprit.
I could be wrong, need a 2nd opinion.
Edit)
You cut the plant? Welp....Pray it isn't 1 of your other 2 throwing the "bastard" pollen.
I'm glad you ripped it up. There are enough damn screwed up seeds going around. We don't need more, right?