Wait, so you want the user to timeout the other user?
Why not have the bot run the command a few seconds after the initial command starts it?
I am guessing you want something like this:
@if@[>||@rand@[0|100]||75||!rkotimeout @target@||@target@ didn't get RKO'd]
!rkotimeout
/timeout @target@ TimeInSecondsHere
Example: /timeout @target@ 10