Halving will be only in 2020. Therefore, I believe that during the 2019 you should not expect anything at all)
when was last halfing? do not think that bullrun depends on halfing. but i agree that bull will not come in 2019.
of course it depends
take a look at this chart ->
statistics are here to show the past trends, but we can make some predictions on that
cause, after the halvings, there were some bull runs and massive dumps, now we are (i hope) at the bottom of the bear, and waiting for a new halving/bull run