The flash was able to save an entire CITY from a nuclear explosion, AFTER the bomb started to go off. So he was able grab every single person, and move them to a safe distance. In the time during the beginning of the explosion, but before any actual damage. Plot is the only reason speedsters ever lose. If they didn’t stop to talk, they could catch and jail EVERY single criminal in the city, in less than a second. All of them. In that one second. Assuming he had to take time to actually research who they are, and then find them. Feeling a bullet on your skin, and reacting, isn’t even that impressive by comparison.
Wasn’t there a test, where they put people into life or death situations, and their perception of actual stimuli wasn’t faster? Rather than asking people what they perceived, they actually tested them to see if they actually did perceive data faster. They didn’t.
Also, lol the intro was kinda weird. A speedster saying he’s in agony, brought to mind to you, whether speedster are in agony? Doesn’t that question literally answer itself ?
On topic of the flow state: This is basically what traditional education of Knights, Samurai etc. aimed to cultivate during a fight. And personally, I think the flow state might also explain several other "holy altered mental states".Like what Dervish dancers do in islam or what Tantra aims to accomplish.