I will use the same method they used to calculate the lightning dodging feat that Akame and Esdeath made, but this time, i will take the value of lightning from this calc.
Esdeath height = 86.7px = 1.73m
Distance between lightning and ground = 298.3px = 5.9522m
Distance Esdeath moved = 157px = 3.133m
Distance Akame moved = 190.3px = 3.80m
STEP 1: Esdeath dodges lightning.
(3.133m*97536000m/s)/(5.9522m) = Mach 149676.5279592 = 17% the speed of light (Relativistic)
STEP 2: Akame dodges lightning.
(3.80m*97536000m/s)/(5.9522m) = Mach 181541.9106997 = 21% the speed of light (Relativistic)
In that case, since Esdeath kept up with Akame, we would take Akame's lightning dodging value.
Lightning! = Mach 181541.9106997 = 21% the speed of light (Relativistic)