I don't think its bad to able to apply techniques you learned from any given system in a new situation, though. Its important to be able to adapt, not just stand there and say they didn't teach me that! Strangely enough I find that BJJ works well for water fighting (yes I have trained with this) and if you happen to get taken down by a bigger guy. Obviously, you don't want to be on the ground long in a self defense situation. It isnt bad to know how to defend yourself on the ground though either. What if you get tackled onto your back by a guy with a knife? What if you can't get to your knees or feet!? Then knowing BJJ would be a huge help! Its non-realistic to assume you can keep the situation where you want it to be 100 percent of the time. In such case, it would be on your feet and alert. Thats why cross training is such a good thing
