Because of the damaged warp core, the Enterprise cannot go to warp even as the Klingon ship begins an attack. When Elaan ...

Subsequent skirmishes recorded in canon include the Romulan attack on a Klingon colony on Khitomer that killed Worf’s parents ...

Having studied Klingon etiquette with Worf, he knows when to attack, and when to take a hit. Klag may get thrown to the ground, but Kargon gets the final blow when he knocks Will to the floor.