I did latest maybe on week 5-6 of flower, would i recommended it ??? If you know how - go and sort what you need.
Yours looks strange, you cracked stem while doing,by colour i have suspicion that some infection got it...
Very strange colour of crop place, try to smell, if any bad smell - use peroxide.
Always take your time and wiggle stem LONG by time and give 3-5 cm length of softening of tissues, be prepared with support, pre think were you will position it ...
I like cropping a lot.
growdiaries.com/diaries/117532-grow-journal-by-asnoriu
Those knuckles change colour, but don't do so brown ...
Make sure all good.
All the Best !