Oregon versus Nebraska

[shipwreck]

I was watching the first game of this Super Regional and saw this positioning and wanted input. Runner on second, trying to steal third. Nebraska catcher throws to third and gets the out. Can someone tell me why in this situation the 3U stayed in foul ground at about the coaches box in a direct line from the 2nd to 3rd baseline extended? Is this so they wouldn't be in the way if the throw was errant? No 90 degree there. Is this what we are supposed to do in this situation? Personally I would think you would take a few steps into fair territory to get the 90. Just wondering.
Dave