لِهَذَا لَا يَتَمَكَّنُ الْعَبْدُ مِنْ عَدَمِ حُصُولِهَا
The servant cannot simply will every ensuing effect not to occur.
A person can decide whether to raise or restrain a hand, but after a blow they cannot independently control each precise sensation or fracture that follows. Thus control over an action does not entail complete control over every consequence.
The argument does not deny observable causation. It sets limits to voluntary agency and existential creation. An unintended outcome can nevertheless be linked to an intentional wrongful deed.