(Request) help with a hide and seek lua function

[[TALOS]Smoke]

I'm working on a map and need a lua function that makes the seekers receive no damage other than from the tranq and/or knife. I have this so far...

function player_ondamage( player, damageinfo )

if player:GetTeamId() == SEEKERS then
if ( weapon == "ff_weapon_knife" ) then
damageinfo:SetDamage(1);

else

damageinfo:ScaleDamage(0)

end

return
end
end