If you entangle two particles at the quantum level and then take particle 1 on a trip around the world. Due to particle 1 traveling closer to the speed of light that particle two it has traveled through time slower than particle 2.
Now if the state of particle 2 is changed will that be reflected in particle 1 instantly or after a fraction of a millisecond. If a time difference is encountered what would happen if you change the state of particle 1 would particle 2 already have been change a fraction before or not ?