I've never seen it taught before, but unless there is a base to award, there's not really anything to call. Now if 1st baseman is blocking the base, you could have your runner run into her and immediatly run to second, if she made it, you get the runner to second. If she is out, then the ump should call obstruction and award her the base she should have made it to (1st base). One bad throw and she could be on 3rd. Assuming ASA.