The Hydra's multiple heads can strike faster than four seconds. Kratos was able to avoid and block its fierce attacks. From what I see in those Zelda games, Link is a slow poke.
K, here's the numbers:
Link can in a cutscene slash a full 585 degrees from a neutral position in 0.1 second. That's one tenth of a second.
A thrust is less than a 90 degree slash, but we'll use 90 for purposes of it being nice big and easy to use.
585/90 = 6.5
So, 0.1/6.5=0.015
In a on hundredth and a half of a second, Dark Link can *backflip* onto Link's sword. A backflip is a complex action, imagine a simple action likea side-step or dodge?
Dark Link has the superior reaction time.