The PA28 overhauled me just after the AFISO made his second call, the PA28's response was calling (after passing me) that he was orbiting. There wasn't a readback to the AFISO's second call. All the exciting stuff probably happened within 20 seconds or so, so this last is understandable.
Just as an aside, I'm not quite sure in my own mind why I didn't initiate a go-around, probably the reasons are a combination of preferring to maintain a constant flight path so that, if the PA28 driver had seen me, he was less likely to fly into me that way (which in retrospect was probably true), and partly the assumption that the PA28 driver would have responded to the AFISO's call (which he didn't).
G