Just to keep stirring the pot, I don't think there was anything suspension-worthy about either hit. Hagel maybe should have gotten 2 mins because Barkov never actually touched the puck. But even that I find debatable because Barkov was clearly trying to play the puck but fanned on it. Not sure how the rules work there. So that's my final decision. Nothing for Tkachuk and 2 mins for Hagel. As always, DoPs made a totally inconsistent mess out of it.
I'm guessing both coaches have laid down the law and warned their players not to get caught up in a tit-for-tat battle over this.