I'm kind of torn watching this. On the one hand, Kelly pretty obviously helps Benson into the goalie (Benson cut sharply, but in doing so was off balance, so it didn't take much of a push to make him lose the balance he still had), so I don't think it should be blown dead until the Avs gain possession.
On the other hand, I've played goalie for a long time, and I would absolutely hate it if players were allowed to shoot pucks at me while I'm in a vulnerable position and unable to recover due to the pain.
But on my third hand, if they blow the play dead, they set a precedent that could allow for goalies to dive in order to relieve pressure in their own zone.
Because of all of this, I don't know what the rule should be, but the refs made the right call for what the rule is.