495. Changing Locations During a Meal
Brachos 4:4
Let’s say that a group of friends eats a meal together and then they stop in order to go out and greet a bride or a groom. If one of them, like an elderly person a sick person, remained behind, they may all resume their meal upon their return without reciting the bracha again. If no one remains behind, they must bentch when they leave and recite the bracha again when they return and resume.
Brachos 4:5
The same parameters apply when a group of people drinks together or eats fruit together; changing one’s location is considered an interruption of his eating. Therefore, one must recite a bracha after what he already ate and recite a new bracha before resuming. If a person changes his location within the same room, he does not recite a new bracha. On the other hand, one who ate on the east side of a tree and relocates to eat on the west side of the tree must recite a new bracha.