it should be

on *:TEXT:?kick *:#: {
  if (%headsortails == $null) {
    set -u10 %headsortails 1
    if ($2 ison $chan) && ($me isop $chan) {
      set %heads_or_tails_nick $nick   
      set %kicknick $2
      msg $chan $2 heads or tails u have 10 seconds or u will be kicked
      set %num $rand(1,2)
      if (%num == 1) { set %num heads }
      if (%num == 2) { set %num tails }
      .timer 1 10 /kick $chan %kicknick u took to long it was %num
    }
  }
}
on *:TEXT:*:#: {
  if ($nick == %kicknick) {
    if ($1 == %num) {
      msg $chan gratz $nick u win
      .timers off
      unset %kicknick
      unset %heads_or_tails_nick
    }
    if ($1 != %num) {
      /kick $chan %kicknick u guessed wrong it was %num
      .timers off
      unset %kicknick
      unset %heads_or_tails_nick

    }
  }
}