UNID signal plus XM

A known frequency for the weird whale-song-sounding or "backwards music" station XM (Attention! Not XW, W for Whale! XW is different, "Workshop", check your Enigma Control List!) is 8707 kHz +/-. Here is a sample from today's song, 0814z.

A UNID signal noted by some Enigma2000 members appeared again on 10683 USB, 0809z. I can describe it as a Jet plus a looping banging sound. But today an XM signal appeared there too!!! Listen! The XM interrupted the UNID transmission. I was lucky to catch this since the station QRT at 0817z. Very weird stuff. Any ideas?