Being a former "AR magazine to the chest and beat em down if they are still up by the time I get to them" Halo player for years I see where you are coming from...now that HC Dom is a big thing its not a huge deal but it takes me a while to readjust if going from Halo to CoD Core unless the DMR or BR were the main loadouts. The big thing that causes me alot of trouble is thinking I can jump much higher than I can for a little bit, however that comes in handy on Express......I never knew you could jump onto the platform from the tracks!!