Why is this not treated as a violation as in “every other breach of the rules” (15.3)? It does not have to be intentional/ intent is difficult to prove, but an illegally positioned second defender breaches 18.1.1.5. Gaining a block from an illegal position impacts play, so 16.3. does not apply. If the teams disagree on whether the second defender was illegally positioned, 1.12. could apply. That would require changing the language in the annotations, but make it easier for players to call and deal with this breach. (That also has occurred in the past.)