How long is the interval between each deop?

Try this
Code:
on @!*:DEOP:#: {
    inc $iif(!$($+(%,deopfld,.,$chan,.,$nick),2),-eu10) $+(%,deopfld,.,$chan,.,$nick)
    if ($($+(%,deopfld,.,$chan,.,$nick),2) >= 3) ban -k # $nick 2 Mass DeOp. Go sit in a corner! 
}


^^ will set a variable for that nick who deopped another nick & if they do 3 or more deops within 10 secs, they will be kick-banned. If they have longer intervals, then change the 10 in -eu10, make it higher. Hope that helps.