Ok, transcript of my rant at Sotek on Discord about what Rook can do:
Flak: Hey Sotek, let's upgrade you against Geiger: Step 1: Pick Rook. Step 2: Use j.C a lot. No, no, more than that. No, even more than that.
Sotek: flak I use j.C a lot against geiger already though so hmm
Flak: Ok well, use j.C even MORE.
Flak: For example, j.C, then jump over a gear, then j.C AGAIN.
Also, if you're getting anti-aired by backfist, know that j.C can beat backfist.
So you CAN jump at that range.
And of course j.C at that range is fine in general after jumping a gear.
At SOME of these types of ranges Geiger can jump FORWARDS to punish your j.C but that's a) a big read and b) you can be far enough away that he can't do this effectively.
So uh, yeah. Use more j.C.
Sotek: I got anti-aired by flash gears a lot
and j.C'd into gears
like im BAD
Flak: Also, never block gears; just be cheeky and jump over them. When I played against Johnny93 he never blocked a gear he didn't have to.
Ok well: Don't jump forwards at that range.
Unless you're prepared to change jump trajectory to be BARELY out of Flash Gear range.
Just find a place to j.C and then ground B to get close.
And then proceed from there.
Also, Geiger should be throwing way fewer gears since he has to jump all the time to avoid your j.Cs.
Just annoy him as much as possible with repeated knockdowns.
After playing Johnny93 I consider the matchup WAY more even than I previously thought.
(JimTheEternal also beat me but it felt like that was crazy reads or something, just being godlike, rather than one very specific strategic innovation.)
Oh also, if Geiger makes you block an axe kick, try mashing throw, because Rook is tall enough that Geiger is often only +6 or so, so if he tried to do a normal or a gear then you grab him.
(Normally he's at least +10 against regular-height characters, and very rarely less than that.)
ALSO keep in mind that due to fucked-up hurtboxes, Geiger's neutral A has basically zero range against Rook.
So even IF Geiger makes you block a move and he can neutral A, he's terrified that he's out of range.
Oh and if he hits you with/makes you block a point-blank gear, you can try to throw, and he would have to Yomi Counter.
(Or Flash Gear I guess.)
(Man I CANNOT wait for the stupid hurtboxes to be fixed; Geiger's neutral A will have double range or something when that happens.)
I fucking HATE it when I HIT with a j.C and then am too scared to combo because ranges basically don't work.
Oh and if you have a life lead and the timer is low, you can use Thunderclaps/repeated j.C to try to stall for a timeout victory.
Flak: Also, Geiger should be scared to try to Flash Gear your jumps if you jump from the right range. For example, if you push A or B his Flash Gear will hit, but if not then it will miss. Or it will hit UNLESS you press C.
And of course if he just sits there he gets knocked down and you're in.
So he can jump at you, but that's risky.
(Geiger's anti-air j.A is admittedly very good against Rook.)
I think it usually beats Rook j.B even.