if (c_trace(my.x,vector(player.x,player.y,player.z),IGNORE_ME | IGNORE_PASSABLE | USE_BOX) < 500 || c_trace(my.y,vector(player.x,player.y,player.z),IGNORE_ME | IGNORE_PASSABLE | USE_BOX) < 500  )

ENTITY* Bullet;
ENTITY* Enemy;

function BeingHit()
{
	switch (event_type)
	{
		case EVENT_ENTITY:
			if (you == Bullet)
			{
				// enemy dead
			}
			return;
	}
}

function main()
{
	//bla.. bla.. bla..
	
	Bullet = ent_create(bla.. bla..);
	Enemy = ent_create(bla.. bla..);
	Enemy.emask |= (ENABLE_ENTITY);
	Enemy.event = BeingHit;
}