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@jadias
Yeah, it was a rather flexy mount I jerry-rigged the night before. My friend's GoPro, not mine, and he just lent it to me and said "Have at it!".
When I took the tube out it looked like it was a patch that had failed somehow, causing the tube to bunch up or expand too much in that area. That expansion fucked the tyre, then when I put the new tube in it just popped right away.
Temperatures here aren't that high yet (below 20C today) and I barely touched the brakes on that descent, which was pretty much immediately prior to the problem. I noticed a 'thump thump thump' sensation on a short, steep climb and when I checked at the top, there was the tyre tumor.