When I hear the charge sound of Doomfist Rocket Punch, I hope it's aimed to somebody else because whoever he hits will pretty much die.

It remind a lot of old Roadhog with the short cooldown hook-combo, but as a support you could theorically avoid Roadhog by not exposing yourself to the frontlines, but Doomfist has Genji mobility and if he wants to trade 1 on 1 with you, he'll do it and can has a good chance to live to repeat it 4 seconds later.