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Had this happen during a frustrating 3 hours at Bantham last week. loads of good size bass but missed or bounced off them all. noticed my new line had a bigger loop than usual,(iff to small the loop jams the spear in the mechanism) it looks as though the loop was catching the muzzle on the way through reducing power and deflecting it as well.Perhaps that's how it managed to get so big. Something similar happened to me once last year. I put it down to something slowing or stopping the spear short (the line can catch awkwardly in the muzzle clip if you are not careful when loading) - but will never really know for sure. I clean-up the spear-tip with a file after every trip - so it is kept reasonably sharp. In your case, perhaps the angle of the fish help turned it into more of a glancing blow. You'd thinking being whacked in the head by a spear would knock the fish out even it the spear did not penetrate.
I did hear of somebody on returning a 90cm speargun because the spear glanced off a fish's gill plate. It obviously does happen from time-to-time. I doubt if the speargun was faulty.
[Sounds like you found a good spot]