You know, the "full contact" ruleset gets too much heat.
I didn't used to like it, but lately I've come to appreciate different rulesets more and more, no longer thinking of one as being better than another, but rather them just being different.
Some of the stuff that both those guys do in those vids wouldn't be realistic under, say, muay Thai rules, but it's so awesome that I feel like there NEEDS to be a ruleset where we can see such beauty. Personally, I wish full contact rules would make a comeback.