Am I the only one never hitherto to have heard the expression "oscillatory stall"?
I am glad you asked that because I have spent the last couple of hours trying to find out what it means (which appears to be a stall with a wing drop).
Last evening, either BBC or ITV Teletext were suggesting that the manoeuvre was carried out at 500ft which strikes me as a bit odd (to say the least). I am not at a TV and cannot verify if this is still showing.