Discussion about R16,P16

At position R16,P16, @qwe started the conversation:

Also known as a one-space high approach (according to Bozulich in 'Get Strong at Joseki)

( FYI @mark5000 )

@shinuito said:

Someone played Q18 in response to this. Is there a common rebuttal, or is it tenuki-able.

( FYI @mark5000 )