"Don't distroy your yoyo..."

video by Lin-Kai.

lately he's been doing testing of his yoyo durability.

video caption says, "as you all know...", "we really need C4..."

what C4? i googled and its some explosive, but how is it related to this video? i seriously don't know what he meant. anyone have clues? does he mean the yoyo is pretty much indestructable?

i sure want to know what he's up to.