As she seemed to have exhausted herself for the moment, it was obviously my business to say something. There was only one thing to say.
"Do you tango?" I asked.
"No," she said, "I don't."
"Are you going to learn?"
"Oh, yes!"
"Ah!" I said; and five minutes later we parted for ever.
The next dance really was a tango, and I saw to my horror that I had a name down for it. With some difficulty I found the owner of it, and prepared to explain to her that unfortunately I couldn't dance the tango, but that for profound conversation about it I was undoubtedly the man. Luckily she explained first.
"I'm afraid I can't do this," she apologised. "I'm so sorry."
"Not at all," I said magnanimously. "We'll sit it out."