Thank goodness for a reasonable explanation. I still don't think it would have been a terrible move (probably because I feel Reed Johnson might have a little more in the tank than he might actually have) but it would be incredibly unconventional. And part of that reason is that there are a thousand variables to consider in that situation (time/score, splits of both batters, splits of pitcher, defensive change, burning a bench player, possibility of extra innings). It's one of those decisions that is really hard to determine and so going with convention and not making waves is usually called for. Hopefully Pena won't be out more than a day or two at most because while the starting lineup may not suffer that much the bench will be stretched incredibly thin without him.