[ Frontal would have offered to take off the mask and reveal that he is indeed merely hiding a pair of eyes, but... the way Keith explains the sinister purpose of masks so haughtily makes him reconsider that offer altogether. ]

... not in an off-duty capacity, no. It's never been necessary.

[ He talks to Angelo in what is a mixture of duty and leisure, but Angelo worships the ground he stands on and that makes for a very different dynamic than this little chat. ]

Though, as you already wondered about regarding names, part of the oddity we perceive from others here might be due to cultural difference between dimensions as well.