There's an annoying bug that happens when you accidentally select a
pokeball you've run out of at the same encounter, you'll get a
pop-up saying you have no more pokeballs, but you're then unable to
try any different ones.
This is what I got when I still have over 40 pokeballs aside from
the one I selected. The only way out of this is to restart the
hunt...
That's correct The chain continues, but you need to find the shadow
again. My average is around 50 encounters for the shadow which
doesn't feel to be higher odds whether i'm starting from 0 or a
previous session.