I don’t think that any action can be considered nondeterministic. A distinction only matters when you assume an action to be independent of a causal relationship, which doesn’t appear to be the case when observing behavior above the quantum level. And while causal detection diminishes at the quantum level, the undetermined action exhibited is not suited to be defined as a product of intent when associated with neural activity, at best it qualifies as a product of unknown cause. All neurological processes appear to operate functionally above quantum resolution. So with sufficient imaging detail of neurological structures, and accurate computational modeling of their function, a definite processes of causation will eventually be demonstrated. It just may not happen in my lifetime.