I'm not familiar with Radnor, but Fallon kinda strikes me as Ne-valuing over Se. (IxE, maybe?)

On his late night show (by far the best), things get a little awkward(er) with more intense/dominant/aggressive guests. Rather than really warming up to the tension and meeting 'em halfway, he kinda stays the goofy kid he always is and keeps some distance.

What that means type-wise (if anything), I'm not really sure, though.