Background info would be helpful here.
So far the argument for the Flash side has been:
1) Speedsteal
2) Everything else
I've largely been dealing with, and think I've legitimately dealt with, most of what comprises #2.
I'm curious how effective Speedsteal has proven in the comic record, though.
Your 1st scan, DS, the one of Flash versus guillotine, seems to show that Speedsteal can only slow, not stop, momentum.
On the other hand, from the monologue, I'm gathering that's a rather special death machine Flash is dealing with, not something ordinary.
The 2nd scan, perhaps more relevant, suggests Flash can take some measure of super speed away from people, but, again, not stop momentum:
Given that Wonder Woman, like Superman, has the strength to participate in the following:
I'm inclined to believe Speedsteal would be ineffective for preventing Diana from an opening bell takeoff to the sky.