So basically the artwork looks like it came from a panel in the Hokuto no Ken manga yet the move being used is none other than E. Honda's Hundred Hand Slap?
You can always tag it both it's not like anyone's going to complain. Even if it's a trace of a panel of something and the artist says it's something else you don't totally ignore the artist. Imagine someone posted pages out of Nick Simmons' comic (this won't happen,) you would tag those with both tags not disregard what the artist says.
Bullshit, this is Hokuto Sanju Setsu (Thousand-Hand Slaughter Fist). It's Jagi's signature attack. Rakangeki is when he slams his hand through the dude.