Thor's speed and reactions were nowhere near as monstrous as his strength. They were roughly on par with Chen Mo's, perhaps even slightly inferior. That allowed Chen Mo to seize every opening in his attacks and block them all with his shield. Thor's greatest strength was effectively neutralized before him!
After several exchanges, Thor realized that no matter how he attacked with Mjolnir, Chen Mo's shield blocked every blow. Meanwhile, the two-handed Knight Longsword in Chen Mo's hand always found his openings, striking from all manner of tricky angles whenever he was least able to defend himself and forcing him to evade with all his might. For a moment, he looked rather disheveled.
It was not that he had not wanted to use Mjolnir to strike Chen Mo's King's Sword. That miraculous shield could withstand his attacks, but surely this longsword could not neutralize them as well.
From what he had observed, Chen Mo was not as strong as he was, perhaps much weaker. As long as he could hit Chen Mo's longsword, he was certain he could knock it right out of Chen Mo's hand!
Unfortunately, Chen Mo gave him no such opportunity. Every attack came at moments and from angles where Mjolnir could not properly exert force. Thor had tried many times, yet he had not even touched the edge of the blade.
Neither sword nor shield could be dealt with, and Thor could not help growing furious. He had never encountered such a stifling battle. His most formidable strength was being restrained by what looked like an ordinary round shield, leaving his overwhelming power, which had swept through countless realms, completely unable to show itself. The frustration was unbearable, and his eyes began to redden!
With a roar, Thor, who had just been forced back by Chen