Why did Han hire such useless guards/bodygurds?
Even in superior numbers, his brown clad underlings could not stop Lee or Williams. His personal bodyguard (O'hara) was only good for beating up old men. When pitted against Lee, he could not land one blow on his opponent and was completely destroyed. Then there's Bolo, who crushed 4 of the aforementioned, incompetent guards like insects, but when faced with one, average sized, dirty-fighting white man (Roper), gets pummelled, kicked in the nuts and dies.
You'd think a guy that was "fearful of assassination" would put a little more effort into choosing people to protect him.