If I am on a ride (not a race) and someone needs something on the side of the road I always help if I can. Usually, if someone had problems like this guy, i.e. blowing his tire off rim (not seated well or something?) I will stop and change the tire for them. Put one of my cartridges on it and off they go and off I go. I don't carry a pump. Carrying one on the bike is always problematic, they don't fit on my bike well (I'm small), I hate on the bike bike pumps, they never work when I need them to, and I don't have to sit there for half an hour pumping tires too.

Besides it is good practice to fix tubes out on the road that way you are ready to do your own when you need to . Sometimes you learn things also, like Campagnola does not have brake releases like shimano they are hidden in the levers (who would have known!).

If you go about changing the tires swiftly and promptly, the guys don't even complain that a gal is changing their tire for them.