"Casting will always be interuppted [sic] upon receiving direct damage."

[Thriar]

Untrue. Shoulder Tackle has a recast time of 30s and all melee dps have a ranged attack called Weaponthrow which will let them attack someone trying to kite them.

Weapon Throw Delivers a ranged attack with a potency of 50.
Additional Effect:20% chance of inflicting Heavy when dealt from behind Duration: 6s
Additional Effect:Removes Sprint effect when dealt from behind
Enhanced Weapon Throw: Shortens recast time to 60 seconds.
Enhanced Weapon Throw II: Extends duration to 12 seconds.
Enhanced Weapon Throw III: Increases effect potency to 40%.

It's made specifically to counter kiting, as you can tell.

So you'll be throwing pebbles at me as I keep heavy on you. Got it. Cleanse is your friend. Also, you'll never hit me from behind since I'll be strafe kiting.