Nine's issue is that he has garbage stamina, he can fight for a few minutes at best before he starts breaking down. Nine is extremely difficult to hit, even Bakugo and Izuku working together failed to land a single hit on him. Once he starts breaking down they were able to break through his defensive.
However, it's bad for him that one of them has precognition. Nine does have a Quirk that tells him how strong someone currently is and what powers they have, but I don't know how much it'll help him. Could Nine restrain them with his Hydras or do they have abilities that'd allow them to escape?
If Nine Succeeds at grabbing them with the Hydras, the twins are cooked as their only real means of escape would be relying on the element of surprise with how bad Hifumi’s singing is (with it being legitimately painful + Alpha resists it) and hoping Nine drops them or gets distracted in the process. Otherwise, Class 5 vs Class G is going quite poorly.
Nine knowing that Alpha has precognition may lead him to try targeting Alpha early on, which I’d say is his best chance at success. Or trying to split the twins from each other with his hydro dragons
Alpha has his own info analysis too, once he scans Nine he’s gonna know about stuff like the Lasers and Hydro dragons which should really help with strategy
Another question is his Weather Manipulation, which is what he resorts to when pushed to his limits.
How do they respond to lightning strikes that are 78.5x faster than their reactions and combat speed?
Writing that down I realize that due to the speed equalization rules, Nine's reaction and combat speed are lowered to match Alpha. Meaning Alpha's Watch is going to be 4.9x faster than Nine's combat speed. While Nine's reactions is higher than his combat speed, it's only over 1.5x faster. Meaning Alpha can likely find a way to hit Nine.
Against the general weather manip like the Tornadoes as well as storm winds the best option for the twins would be opting for Stealth and retreating given they can’t beat out the weather manipulation quirk in raw power at all.
With Precognition, if Alpha can nail the timing he could possibly block and disperse a lightning strike from Nine with his Alpha Watch shields since the lightning comes from the sky, giving some room for it to travel (given the watch’s elemental intangibility) , although trying to do this would be really risky.
Otherwise it’d be Alpha either warning Hifumi or dodging himself when he sees a lightning strike coming soon. But his predictions are kinda hazy when they branch off in this sense. Hed mainly just see alternate futures one where he’s getting electrocuted by a lightning bolt and one he doesn’t and one future gets hazier the further he gets from it or clearer as he’s approaching that outcome. So he has to put the pieces together with his high intelligence on how he got that outcome.
So Alpha won’t be predicting every little thing nine thinks or does, which leads to as you said, the twins tagging him before his stamina fails him being troublesome
If the lightning tags them despite their best efforts though, that would be Nine’s win condition. Powerful Electric shocks to the head are basically Kryptonite for Alpha. (He can give himself light shocks to his brain if he really wants very direct, clear and accurate predictions in this battle, but that’d put more strain on his head). While Hifumi has no electricity resistance, so at the very least she’ll go down if hit by it.
With Alpha hitting Nine (wow I forget Speed equal rules can be weird like that). Yeah pretty much, but Alpha’s basically gonna be dishing out chip damage given his AP at a baseline is 149 tons and he’d need charge time to go higher. Although that’d wear on Nine if we’re past the point where he’s falling apart
On the twins side they also have the option of sealing Nine in an attack reflecting Hifumi ball, but given how much issue someone as agile as Bakugo has tagging him, they’d have to sneak him to pull that off or he’d need to be exhausted
