빠져나오다 and 빠져나가다. It is the difference between 오다(come) and 가다(go). It is similar to English. 오다 is when the result brings smth/smn nearer to the speaker, 가다 otherwise. ex) 회의 중인데 빠져나왔어. => I slipped out from a meeting. (the speaker is now "with" the listener, so 빠져나오다) 용의자는 경찰의 포위를 빠져나갔다. => The suspect slipped out of the siege of the police. (the suspect is now somewhere away from the speaker)