Your code is not wiring up the someEventHandler action method during the create of someComponent.

The empty {} in the call to $A.createComponent() needs:

{
   someEvent: component.getReference("c.someEventHandler")
}

See https://developer.salesforce.com/docs/atlas.en-us.198.0.lightning.meta/lightning/js_cb_dynamic_cmp_async.htm for an example of how to do that.

Your code is not wiring up the someEventHandler action method during the create of someComponent.

The empty {} in the call to $A.createComponent() needs:

{
   someEvent: component.getReference("c.someEventHandler")
}

See https://developer.salesforce.com/docs/atlas.en-us.198.0.lightning.meta/lightning/js_cb_dynamic_cmp_async.htm for an example of how to do that.