The other day in class I was told - half-jokingly - to "watch the claws." This is the first time anyone has said anything to me about being pinched when I go for any kind of hold on their gi. Is there some other way for me to secure a grip to avoid doing this to training partners or is it something that just happens and people learn to deal with it? We generally spar pretty hard if that makes a difference. Thanks for any help.