I got into a discussion about tagging up the other day with some softball teammates. I was of the opinion that the runners can tag up on a fly ball as soon as it hits the outfielder's glove (or hand, or face... or whatever). Not when an actual catch is made. My friends proceeded to tell me that its when the catch is made that matters, so, theoretically, someone could 'bobble' a ball all the way into the infield, never giving the runner a chance to tag up. I can't imagine that... because, I've never seen a pro OF bobble a ball intentionally (which, really, isn't that hard to do) to mess up the timing of a guy tagging up (or even trying to double him up off 3rd). Just wondering if anyone here can help me out.