On a side note, turn off execution times in the ColdFusion debugging. That will significantly impact your performance.
I’m not sure if I completely follow your question. If an error is being thrown from inside a handler, the error should trigger the standard ColdBox error handling (unless you are try/catching it yourself). Where/how are you trying to deal with the error? In you onExceptionHandler, or an onException interception point? The handler will get the exception bean passed into it and the interecptor should get the cfcatch struct (not sure why those two get different stuff though). Do you need an exception bean specifically (i.e. an instance of the coldbox.system.web.context.ExceptionBean component), or are you just trying to figure out how error handling works in general?
Perhaps you can elaborate on what you are trying to achieve and what issue you are encountering.