Albert raises some good points, but I believed it was more than to just take down the giant ... actually I believe it was a way to lure one of the henchmen over.
Listen, it's not the greatest movie, but it does have some good points. Bronson's character is a professional after all: not just at killing but (as we are meant to believe) at reading people. That's why he went into the cantina that most would avoid and went up to grab two beers alone ... he was trying to draw out a problem using the widow, and then handle it in the most audacious way possible, which would (as I said) lure over on of the doctor's man, who (if you watch closely enough) was not your average guy and into some wicked stuff.
I know this may seem like I am doing a lot of guess work here ... BUT the proof is in Bronson's character putting his hand on the other guys' when they sit down together. He just HAD to know what kind of response he would get.
So in short: it wasn't just about surviving and inflicting pain: it was all part of his trap ... granted the "trap" relied a bit too much on the reaction of other characters, but if it's Bronson in the lead, best not to question.
Enough is enough. You have my 2cents+ worth.
The giant passed out because Holland put his foot to the guy's neck. Yes, the crotch-grab was painful, but that wasn't why he passed out.
I have a distinct feeling that the pain of having his junk TWISTED and WRENCHED apart by Charles Bronson might have contributed to the guy passing out. This sort of thing can really mess your body up, right down to your equalibrium.
I may not know a lot, but I do know "a lot" is two words.
Hey even worse, just imagine a gal twisting a guy's teabag *as he's ejaculating*.