I have to say I gave up using it after a couple of near misses, and only use it for when moving the sheep to make a chute etc, so under supervision. It Ought to be ok, but seems to result in quite a few accidents, which commercial shepherds might just accept but I can't. Most smallholders seem to stop using it because of that factor.
Op Im really sorry about the lamb, it's not your fault and really bad luck. but it is something that will happen again most likely if using the netting as core fencing (NB I also hated finding dead hedgehogs in it :-(((