While my plant was growing, also shortly after topping, my lights fell on it and completely broke off the left top and royally fucked another branch. There was absolutely no hope for the other top so I just went into fixing the other branch. I mean this branch was fucked bad dude, I just couldn't accept that I lost a top and another branch on my small plant. Anyway, I took some SCOTCH tape and taped it back up and let her do her thing. Shit healed up just fine. I really didn't think it was going to make it but it turns out that as long as you put it back nicely into position and it's not completely ripped off, cannabis heals itself very well. You should be alright but I'd be able to make a better judgement if you had picks. Best of luck to you!