Since the movie is in the 80s. Clearly, just based on that arrow being shot from nowhere, some magic or artifacts can still exist in PI that could make PI citizens a cannon fodder from DCU. After all, according to Hippolyta, the gods gave them "many gifts."

or what will be really cool is if PJ can include a future scene past the Justice League showing the amazons going through some sort of ritual that re-opening Pandora's box and releasing once more items the gods placed in there that could the change the future of the amazons: Ambrosia.