Then they weren't obstructed. They're just shit at their job.
If I know you're in a building and haver permission to arrest you, it's not "obstructing arrest" if you use the back door. What if your car's parked out back?
To quote the 10 year old who destroyed me in fortnite "Get good."
I could be if you can't enter a store to arrest someone and back door is marked "private employee only". Manager then let's them out the back door despite clear enforced store policy to prohibit random customers from being allowed in that part of the store.
