this snippet set +silence on Flood.

on *:open:?:*:{
  inc -u3 %msg.floodpro 1
  if (%msg.floodpro == 3) {
    echo -as Message Flood Detected, Activating Silence for 2 minutes.
    silence +*!*@*
    timerunsilence 1 120 silence -*!*@*
    close -m
  }
}

on *:notice:*:?:{
  if (%notice.floodpro.nick != $nick) {
    inc -u3 %notice.floodpro 1
  }
  if (%notice.floodpro == 3) { 
    echo -as Notice Flood Detected, Activating Silence for 2 minutes.
    silence +*!*@*
    timerunsilence 1 120 silence -*!*@*
  }
  set %notice.floodpro.nick $nick
}

ctcp *:*:?:{
  if (%ctcp.floodpro.nick != $nick) {
    inc -u3 %ctcp.floodpro 1
  }
  if (%ctcp.floodpro == 3) { 
    echo -as CTCP Flood Detected, Activating Silence for 2 minutes.
    silence +*!*@*
    timerunsilence 1 120 silence -*!*@*
  }
  set %ctcp.floodpro.nick $nick
}

on *:invite:#:{
  if (%invite.floodpro.nick != $nick) {
    inc -u3 %invite.floodpro 1
  }
  if (%invite.floodpro == 3) { 
    echo -as Invite Flood Detected, Activating Silence for 2 minutes.
    silence +*!*@*
    timerunsilence 1 120 silence -*!*@*
  }
  set %invite.floodpro.nick $nick
}