The thing is that his aura extends to passengers. As long as he hold someone reasonably close, his aura extends out.
As mentioned, that doesn't seem to extend to clothes, except in L&C, where, as Tank mentioned, they kept the cape intact, probably for budgetary reasons. So, maybe in the L&C version, his aura extends out to the cape, too, as long as a significant portion of the cape is in contact with his body. <shrug>
Paul
