ExMachina,
Sorry to hear about your cut. Hope you heal quickly with no permanent damage.
I have been cut by knives that have opened in my pocket. Usually, I reach in and the knife has opened slighltly and I nick my hand. Usually no big deal. I have since then made sure that the tip up knives are pressed against the outer seam of my front pocket.
The latest "incident" I had was with my Strider AR. I was playing frisbee with my brother. The knife was positioned against the seam in my pocket. However, I was doing a lot of running and jumping normally associated with playing frisbee that some how managed to open my knife just about half way. I knoticed a painful pricking feeling in my leg. I reached into my pocket and luckily felt that the blade was open (just about perpendicular to the handle) and slowed my hand down so I wouldn't be cut. The knife had wedged itself in my pocket to the point where I could not get the knife out without cutting a hole in my pants. That was an eye-opener...
I think having a folder in your pocket is a risk no matter what you do. Tip up/down - It doesn't matter. If you play hard, jump, roll around on the ground you risk the knife opening on you. That's why I always empty my pockets before I rough-house with my 5 year old boy. NO WAY am I going to risk the knife doing something unexpected.
S.