B can use different cut angles (cutting open to break, away to break, or just cutting in a straight line); this teaches the thrower to read cutter angle and time their break move
Making a break mark drill more difficult will vastly improve your throwing ability; here, we force the thrower to hit a precise point on the field.
A thrower, A, stands 10m from the sideline and is marked by D1. A cutter, B, starts 15m deep of A. A cone is placed halfway between A & B, 5m from the sideline.
D1 > A > B. Use a small queue of players at both ends.