As a frequent Ana player I noticed that occasionally my Nanoboost doesn't reach the designated target.
Sometimes due to the fact that either Mercy flies by or a Tracer zips into my line of sight at the wrong time but mostly because too much going on during a capture.
Imagine Lúcio sliding from left to right, McCree rolling in and out of the frame, two Reinardts trying to bash each others head in and a Roadhog hooking people left and right occasionally blocking my line of sight to Reinhardt together with several other heroes.
How can I make sure my Nanoboost hits Reinhardt in this mess of people?
Is the target locked the moment I hit Q or can other heroes intercept my ultimate while I raise my arm to fire?