For me unless there is telltale sign its hard to tell if something was shot separately as a different element, unless it draws attention to itself.
I have no way to know if Amy was shot separately from Ewan, but sure looks like it.
Yeah, there appears to be a number of these kind of shots throughout the PT.
Like the Geonosian battle in AOTC - where both Jedi and droids in the background die despite not being hit by anything.
Or at the other end of the scale…
Mace Windu misses trying to delfect away a blaster bolt… and gets shot in the torso! 😉 (poorly misaligned CGI)…
OR here: Star Wars EP2: Execution Arena - at 1 min 32 secs into this video (it can be seen more clearly playing it back at .5 speed)