The Combat rules have to say this about [Running](http://www.d20pfsrd.com/gamemastering/combat#TOC-Run): "When you run, you can move up to four times your speed in a straight line ...".

Now my question is: what if I'm in a dungeon, or more generally in a place where there isn't much open space, and want to flee/get away?

As in a dungeon the possibility to have "straight lines" is little, can I only flee by "normally walking away"?