Good way to get your arm snapped.
Eh, not really. It's not like grabs and locks are foreign to us. I'd even go so far as to say that we're pretty familiar with them in a chisau context. I was more pointing to the structure and sensitivity. But, just because we might play a certain way in Chisau, against other WC practitioners, doesn't mean we'll do the same thing verbatim against, say, a grappler. Heck, in that particular clip, they were rarely even striking. This is akin to me watching a BJJ match (well, not even that. A playful rolling session that is purely BJJ on BJJ) and commenting that "geez, that looks like a great way to get punched" because they're not worried about, and don't account for strikes, being that it isn't an MMA/SD setting, but rather just friendly rolling working solely on BJJ techniques.