3-3 point very distant low approach, tenuki
This is certainly one of the rarer aspects of the 3-3 point. The approach with is not very threatening at all. In a few examples from pro play, Black typically does ignore it.
In fact the points a and b may be like miai, in Black's thinking. The exchange White b-Black a is surely fine for Black, while White's pincer at a isn't very serious.