Bards had this back in 2.0 and it was a tp drain, iirc it went wide volley -> rain of death -> quick nock. You had a % chance that if WV hit, RoD would be free, and there was also a % chance RoD would make QN free, so in some cases you could use 3 aoe skills at the cost of one. But the number of times that happened was to far in between to really matter and it didn't even grant any increased potency either, so it was kind of pointless to do your aoe rotation.