One of the two saucers will be lit for lock. To release the locked ball, shoot all the way through centre spinner lane when release is flashing. Release can be toggled on or off with every sling or pop hit.
No skillshot but a good plunge is through the lit 2x lane. This will light 2x bonus multiplier. No lane change, they rotate every few seconds on their own and flipping will simply stop the light where it is for 5 seconds.
Lock stealing is a thing in multiplayer games! Look if release is lit before plunging during a multiplayer game. Short plunge if it is, to steal the locked ball and begin multiball