So, to clarify, 10-count means 'out of the fight, completely helpless' for a 10-count. Herc getting tripped over and over isn't that, especially since he can still pull off thunderclaps and such, or even ineffectually attempt to catch the speedster with a hand from the ground. He can't, because the speedster is too fast, but he's certainly not immobilized/KO'ed/whatever for a 10-count.
As for martial arts, while being strong doesn't negate leverage, there is a point where leverage fails - speaking from experience (including a bucketload of experience with various sorts of grappling), weight and strength DO matter, they DO make a difference, and Hercules is about a million times stronger than anything a martial artist would normally face. Martial arts are not magic, they don't really allow people to throw around someone who can pick up and tow islands - maybe once if they catch him really off-guard, but after that, Herc just settles himself and nothing human is going to remotely budge him, so long as he doesn't overextend. Herc is a 'martial arts master' himself, with thousands of years of experience and training. He's actually considered highly skilled by comic book standards.
And even if they can throw him or whatever through comic book magic martial arts
, they can't lock or choke him, and the throw won't do much except make him laugh.
Dodging in and out is easy when one is a speedster, obviously. One doesn't need to throw stuff in Herc's eyes to do that, and even if one does throw stuff in Herc's eyes, what then? Barring the speedster being capable of hurting Herc or 10-counting him, once again we're back to them being incapable of doing anything while Herc cleans out his own eyes and learns to squint.
Or, again, in an enclosed area, just thunderclaps over and over and over again until the pitter-patter of tiny fast feet just...stops. He can do that blind, as well, or while blinking the sand out of his eyes.
Basically, the speedster needs to be capable of hurting Herc at the least to start racking up damage (hopefully before being thunderclapped into insensibility). Or have some kind of weird trick they do (speedforce shennanigans, whatever) that might allow them to take Herc right out of the fight.
Otherwise, we have someone of ridiculous speed who can't actually hurt or 10-count Herc, and is likely sadly vulnerable to being hit by Class 100 created shockwaves.
Here's Grey Hulk - someone a chunk weaker than Hercules, actually - dealing with Quicksilver. Granted, it's Quicksilver doing the silly 'run circles around people' thing, but the thunderclap is a good demonstration.
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