Nor anyone acting on its behalf
|Towards more picturesque speech™
For if, by the lights of the law, a principal has no right to do a thing, it follows as a matter of ineffable Latin logic that neither may her ox, ass, servant, agent, attorney, nominee, delegate or other mortal representative do that thing on her behalf: nemo dat quod non habet: one cannot give someone else a power one does not have oneself.
Now if such a representative independently happens to be entitled to do that thing, it is a different story — but even here, this ghastly confection won’t save you: such a representative would not thereby be acting under her own power, not courtesy of yours, and would not be acting on your behalf at all. Seeing as she wouldn’t be your representative in the first place, this purported stricture will fall upon stony contractual ground.
So, be bold, young eagle of the law: wherever you see this construction, strike it from the record.