Worry not and keep going. I did a White Skunk the same way not long ago. I trimmed off the damage including the entire top of the cola. The damned thing fimmed! I mean it turned into this ugly cauliflower chunk I nicked "Big Ugly". Like I said, trim and keep going.
It was a plant topped more than once and the cola I trimmed off the top was one of the 4 main colas. It turned out way shorter but way fatter and weighed almost the same as its sisters did.