[Facerafter]

OR, just use the OnPlayerTakeDamage public.

pawn Code:

public OnPlayerTakeDamage(playerid, issuerid, Float:amount, weaponid)

Get the team id of the issuerid and if its the same as the teamid of the playerid, you can do

pawn Code:

if(issuerid != INVALID_PLAYER_ID)
{
new Float:health, Float:newhealth;
health = GetPlayerHealth(playerid, health);
newhealth = health += amount;
SetPlayerHealth(playerid, newhealth);
}

There could be some mistakes made this really quick, but i think it should work.