Crysis 1080p Full HD Slow Motion

Rendering Crysis at 1080p Full HD at a fixed time step of 0.004166625. The commands i used for rendering this were:
fixed_time_step 0.004166625
e_particles 1
r_useEdgeAA 2
r_displayinfo 0
sys_physics_cpu 0
capture_frames 1 (to start recording)
capture_frames 0 (to stop recording)
The map i used was Photoreal ii

[@0xCAFEF00D]

I have some questions.
I'v been reading up on Fixed_time_step
and Capture_frames on doc(dot)crydev(dot)net
It doesn't really go into depth on how it acts.
Fixed time step, does it just step (in your case) 0.00417/th of a ingame second every second all the time?
Or does it work like say /avidemo in cod4 where it steps that amount, allow the game to take a frame and save it, step next step.
Or how does it work?

[@maamf2012]

What kind of mod did you used on this game?