IMO it was pretty safe. He could have done
BK activate > 5D(1)>DS>5D(1)>GH>6D>DID>j.D>BE>5D>22C (whiff)> Hell's Fang x2>ender
Which is equally easy, looks like it still works, and gains more meter. But what do I know.
EDIT: And if he didn't drop his combo but it's Kaqn, he could have landed another Hell's Fang. :/