No, all of this events happened on a good surface and not at a high speed It's funny but at that day nothing happened to us while we rushed through cross-country, stairs, road kerbs and other dangerous places.
And the first friend had torn his drive chain because the second broke that plastic stuff on the handlebar x)) After this he can't switch a speed or something. Ah, the first friend is heavyweight - 110 kg, so... x)) I think the model of the bike he has is not really suitable - cheap bike with front and rear suspension:
(but white color)
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Here's my old bike (photoshop of that blue bike):
The fork is bent, because I rode on it "through" the brick wall I wonder where is this bike now, my dad gave it to someone when I became too big for it.
EDIT: I also had punctures on this old bike. There was a lot of them, and even when I replace an old inner tube with the new one - punctures chased me. Because there was some unknown defect of the tire and we loved to ride in bad places х))