(In my usage, which may or may not be standard, if something feels like a Bayesian update for each of two different mutually exclusive directions, you sort of cancel out the overlap and then only refer to the net remainder as the thing for which you have Bayesian evidence. Like, if it independently seems like a 3 update to the west, and a 5 update to the east, when you consider each separately, you say “a Bayesian update of 2 to the east” or similar.)
(In my usage, which may or may not be standard, if something feels like a Bayesian update for each of two different mutually exclusive directions, you sort of cancel out the overlap and then only refer to the net remainder as the thing for which you have Bayesian evidence. Like, if it independently seems like a 3 update to the west, and a 5 update to the east, when you consider each separately, you say “a Bayesian update of 2 to the east” or similar.)