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All the scans below are taken from the same GIF, which was three seconds long but had only 42 frames. This means each frame is 0.07142857142 seconds.
Speed[]
The Helltaker is 22 pixels here and he travels 21 pixels in a frame. He is kinda crouched down in these scenes but since he's so big and burly, I think that using the average man height here would work even despite the crouching.
22 / 21 = 0.9545454545454545. 175.3 cm for the average american man height, so 175.3 x 0.9545454545454545 = 167.33181818181817385 cm or 1.67 meters travelled. This is all done in a frame, so 0.07142857142 seconds. So 1.67 / 0.07142857142 = 23.3800000028056 m/s. This is Superhuman.
Attack Potency[]
Helltaker kicks a rock. He himself is 23 pixels here while the rock is 21 px by 10 px by 12 px.
21 / 23 = 0.9130434782608696 x 175.3 = 160.05652173913044088 cm.
10 / 23 = 0.4347826086956522 x 175.3 = 76.21739130434783066 cm.
12 / 23 = 0.5217391304347826 x 175.3 = 91.46086956521738978 cm.
It's roughly a rectangular prism so 160.05652173913044088 x 76.21739130434783066 x 91.46086956521738978 = 1115739.429443576979157497841735843579736585376838948208224 cm3 or 1.1157 m3. Since it's a rock, using continental crust values: 1.1157 x 2700 = 3012.39 kilograms.
Now the speed again. It moved 21 pixels while Helltaker is 23 pixels. 21 / 23 = 0.9130434782608696 x 175.3 = 160.05652173913044088 cm or 1.60 m traveled in a frame, so 1.60 / 0.07142857142 = 22.400000002688 m/s. Still Superhuman.
Now KE using the speed and mass, giving us 755748,4031999998 joules, Wall level. What a surprise.