Regarding the original topic of discussion, I presume this is on an MTB specific path, otherwise it would be you who was in the wrong. Even so, you've only really got yourself to blame if it was an exit (hence the reason that many trail centres have obstacles in place to prevent you from flying out onto a shared used path), and a blind one at that. I'll only ever attack a section of trail flat out if I can see far enough to come to a complete stop, even if it's at a trail centre. You never know who or what could be around a blind corner - could be some idiot walking their dog up an MTB trail, but could just as easily be a downed rider or someone with a mechanical. If you want to ride as fast as possible at all times with no regard for other potential trail users then get yourself on an uplift day for a downhill course, otherwise it's only common sense to exercise a little caution if you can't see what's coming up.