Unfortunately that's still to high, the more I look into it, the more the size gets capped, I'm sorry mate but I don't think I can agree to this feat, I can't speak for others but there's just way to many issues I see with it.
(In order for it to be 18m it would have to be dozens of meters away from Batman or tens of meters away from Batman horizontally, neither is true. And if it was, it would mean either Lincoln is a huge giant in that blast and multiple times larger then he usually is to seem that large from the required distance it'd have to be to be 7-8 rad, which in turn would make the blast even larger, which creates a loop of ****** up scaling).
The jet didn't overtake him, Batman is located in the turbine in the central part of the plane, the plane is moving towards Lincoln. This places Lincoln between the front of the plane, and the wing.
It quite literally couldn't have overtaken him, because we see that it didn't, Batman is looking toward the blast.
Actually, what you just said would have made it worse, because if he stopped the plane wouldn't have created distance, it'd have shortened it, he'd be even closer to the plane. That argument actively works against what you're proposing.
Awfully big pieces for body armor. Given there's like a dozen specks as large as the head you're proposing.
If the armor difference is actually due the blast, that helps. But not really because still space issues.
I'm not arguing what Batman can, or can not do here, as it stands I'm already on board with a solid 9-A tier, leaning toward 8-C.
I'm arguing the values you've obtained with your pixel scaling results in an explosion size that is far to large for his position ion relation to the environment and if it was actually that large it would have struck the plane he was close to as well as him being far to close in preceding panels, including the very same panel he he went "oh shit" as we can see the plane in the background of the panel, mere meters away. I have no issue if Batman could hit harder, less than, or whatever than the bomb, I just hold issue with paradoxical scaling.
Could be pieces of his armor breaking too
You said the specks are pieces of the armor right? That's the same, it doesn't inherently have to be his head and chest, it's not like he see his arms, the specks right below it also don't line up inherently with leg positions or length. It could be him, or it could just be pieces of his helmet or armor being launched outward from the center. Because remember, that's an explosion, omnidirectional in all directions, he should be in the center of it. If we're saying that's him the explosion would either be pretty thin from a depth perspective, or it's just pieces along with the rest being launched in all directions, in this case, forward.
That's just one of many potential explanations, but lad, I ain't here to explain it. It ain't on me to do that. Hell it
could be him and maybe everything you shown is indeed correct in terms of that one panel, that still wouldn't solve the issue of that single panel contradicting all the other panels of that sequence in regards to position, distance, environment and things we can't just ignore.
Honestly, to give you an idea how utterly ****** it is, even in that same panel there's issues like the blast only being 13-14m away at maximum based on your own scaling, and that's from a front on distance, in terms of distance from the plane from horizontally, it'd be way closer, in fact given Batman is in the turbine, of which is only 4~ meters from the windows, and the blast is happening in front of Batman, not way off to the side as it's in his view. That alone caps the blast's size, from the view we see the blast, and where Batman is situated, the blast has to be either dozens and dozens of meters away in front of the plane by a good distance (It isn't, it's 14m away by your own scaling, so not in front of the plane, or just about the same, made worse because it has to be so much in front of the plane that plane isn't visible from that angle), or far off to the side (it isn't, Batman is looking it dead on more or less). If both A and B aren't true and factually so, that means the blast can't be larger than a handful of meters as even in that panel, the location caps it.
Factor in preceding panels showing how far away Lincoln was, It's simply impossible no matter you scale it or argue it, even when talking exclusively the blast panel itself.
So then we have to ask, what's more consistent? The huge explosion size you got? Or the location and general distance everything is from each other? I'm arguing second is more consistent and displayed, and thus your calc can't be true, it doesn't make sense and contradicts the material.