[nemesis_567]

Use it on OnPlayerUpdate.
Something like:

pawn Код:

OnplayerUpdate(playerid)
{
    if(GetPlayerHealth(playerid) < 25.0 && GetPVarInt(playerid, "CrackAnimDone") == 0)
    {
         //ApplyCrackAnimHere
         //Set here a variable so that the crack animation doesn't keep applying. Something like 
         SetPVarInt(playerid, "CrackAnimDone", 1);   
         TogglePlayerControllable(playerid, false);
    }
    else if(GetPVarInt(playerid, "CrackAnimDone") == 1 && GetPlayerHealth(playerid) > 25.0)
    {
         //remove the animation
         SetPVarInt(playerid, "CrackAnimDone", 0);   
         TogglePlayerControllable(playerid, true);
    }
    return 1;
}