It seems that at least one Pakistani aircraft was shot down, as it is now being reported that Pakistani locals beat the pilot to death thinking he was an Indian. This may account for the original Pakistani report that they had captured 2 Indian pilots and not one.
https://www.liveleak.com/view?t=usb2a_1551531205
The most believable version of events is that the Bison went after an F-16 of unknown mark and downed it with an R-73 but was then in turn shot down by an AIM-120C5 launched by a second F-16. Although I must admit that AMRAAM fragment doesn’t look like it came from a missile that actually detonated.