no class need to switch weapon to give warning, you ever take time to look their combo starters? i avoid 8/10 kb's coming on me, even demo detonation is sooo easy to avoid, every time they use hellfire stream and u go close them, they will try to use it, same with baddie conqs, every time they come out from cd they will use burst of lameness, atleast with melee kb's u can do them in air and cut the animation out, that wont give any warning