On the play, Howden crossed through the neutral zone to deliver the check to Tanev, with the focal point of contact being against the head. Tanev's helmet clearly snaps back, and he falls awkwardly on his leg down to the ice. To make matters worse for Howden, Tanev was not playing the puck at the time either, also making this reckless interference.
Hopefully, Brandon Tanev is able to recover quickly from any injury sustained on the play, as he's an important player for the identity of the Kraken. For Howden and the NHL at large, hopefully they learn the consequences of dirty checks like this, and take more caution in the future.