The feeder is "A", the juggler to the feeder's left is "B" and the juggler to the feeder's right is "C".
The feeder counts "1 2 3" to make it easier to keep track of where we are in the pattern.
On beats 1 and 3, A (the feeder) and B exchange a pass. On beat 2, A and C exchange a pass. On 3, juggler B catches the pass and walks on four count (rotating the positions anti-clockwise).
1. "iC": The manipulator (M) intercepts the pass from A to C. The juggler who was C is the new manipulator, and reads from the manipulator line.
2. "cA": The manipulator substitutes a _pass_ from A to B.
3. "sC": The manipulator substitutes a _self_ from C (to C).
The passes _from_ the feeder are not manipulated, the feeder does only normal pass throws to B, C, B