>>42429668
>that has no counter and cannot be stopped
Airblast, specially paired with the Reserve Shooter
Rocket at feet knockback
Scout, specially the FaN, reverted Soda Popper and specially BFB that can actually outrun a 4 heads demoknight
Piss mid-combat
Heavy, specially the Natasha
Literally any shotgun
Direct pipe hits will demolish a demoknight regardless of loadout
Sticky traps on chokepoints
Sentries
Using terrain so you dont get charged
Being overhealed
Staying with your team, dont isolate yourself, 1vs1ing is what demoknight wants
Random crits
Simply shooting down the nigga, he has a sword you have a gun

There's a reason why you dont see targefags top scoring, and barely affecting the balance of the match, but you will absolutely see a good TTfag demolishing your entire team while top scoring. Because this is a very damage oriented game, and being able to kill fast will always be better than being able to die slowly.