ExaltedBagel |
It's important to take into consideration the intelligence of the monsters when you are designing the encounters. In the current situation however, orcs and goblins can be expected to five foot and maneuver is fights considering their whole culture is based around warfare.
The situation would be different if the orcs had designed a clever trap requiring mechanical gears and a trigger, this would surpass their usual cleverness which might however lead them to dig a crude pit trap at an ambush site.
I always value challenging players and doing so fairly, they have the option to 5 foot in order to reposition as well. You players might have been surprised by the fact that your monster's have brains, but they should learn how to manage!