This week started off well, I topped two of my plants, and they seem to recover okay, but then disaster struck. I was trying LST for the first time, but in my excitement I accidentally snapped two of the lower branches off. Not quite sure how big a deal this is, I hope she will recover and not impact my yield too much.
It happens, you're fine. Honestly I remove those first node branches(sometimes the 2nd too)anyway as they tend to grow stretchy with large gaps between nodes. When using LST, take baby steps when working with stems that are starting to stiffen up.
You'll be fine with the lack of air movement at this stage of your grow, shouldn't cause you any issues! As long as you got a replacement fan coming at some point within too long, I would not worryπ