I'll only speak for a moment and then pass it on, maybe to Professor Rigakos here.
Assuming that it's useful for Parliament to provide clarity on the extent of the scope of the powers of a citizen's arrest--which I would quite agree with you is important--if you're going to provide this power to a private citizen, it's important to be as clear as possible.
My difficulty with the proposed amendments is this reasonableness requirement probably doesn't accomplish that. So I think there's a concern that we haven't clarified the nature of these powers. If anything, we've created a situation where the individual may be less certain about whether it's appropriate in the circumstances to exercise the power of citizen's arrest.