Eddie,
Like the others have said...don't worry about it. You've learned something. Many times an IW occurs when something unusual happens, or where there's a moment or two of indecision--like when the B defender just stood still.
One comment though on your thought process. Forward progress is not something that the runner stops. It must be stopped by contact from a tackler. A runner who voluntarily stops his forward movement is still a runner and the ball is still alive. Don't mistake this situation for forward progress being stopped.
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Bob M.
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