So once I drove up to a crate and got a Scrin crate, I started flying up, but I got back in my Humvee, and I was fine; this also applies with the c4 on the head, if you get in a vehicle you won't die when it goes off). I soon got out of my Humvee, for it needed repairs, and I began to fly up into the air. I did eventually die, but it took many, many minutes of flying up.