I just played three matches of Walker Assault, but I still haven't fully understood the uplink mechanics. So there are always two uplinks on the map. Controlling them as rebells gives you "locks". The longer you control an uplink the more locks you gain. Locks are represented by fighter symbols at the top of the screen. Right?
So how do these locks correspond to actual fighter attacks? When do fighters attack and how many fighters do attack the Walkers?
Number of Ywing Symbols correspond to how many Y wings ion bomb the Walkers. When the blue crackling occurs players can cause damage to walkers, the more Y wings that attack means this window of Vulnerability is longer.
Y wings will commence their bombing runs when the bar at the top of the screen hits/fills the nodes in the bar.