Definition mass shooting involves person(s) opening fire on group of innocent people with intent to kill or harm, even if people aren't harmed it is counted as a mass shooting.
All of them are categorised as mass shootings, police reports and all. List of names and such.
This Filipino fortunately had even worse aim than Randy Stairs, so no-one died. But it IS a attempted mass shooting, if the /Pol/tard recovers he's facing jail time.
Here's hoping that our little friend recovers and gets karmic justice soon.