You prob have not truly punctured it, that crack must not be totally thru the cell membrane. I would seal it with shoe goo or something like it that's flexible and air tight.

If you had punctured it, you would have had a leak and odor come from it and it likely would puff. I punctured one with a small stick running in some woody debris and was lucky to have gotten to it and removed the lipo before it ruined my truck. It made a ton of smoke and got pretty hot, hot enough it would have melted my truck.