[Babul]

may i suggest you another solution?

Код:

	new Float:Angel;
	GetPlayerFacingAngle(playerid,Angel);
	SetPlayerFacingAngle(playerid,Angel-20);
	new string[32];
	format(string,sizeof(string),"Angle: %f",Angel);
	SendClientMessage(playerid,0xffffff,string);
	return 1;

i tested it with a simple command, working in both directions...
imo your idea is neat, so i'll include it aswell