If you are trying to spread terror among a group, whether it is women, Muslims, gay people, regular people, or any other group, then it is terrorism. Was this perp trying to terrorise Muslims, into not immigrating into Quebec? If so, that is terrorism.

Also, a terrorist can kill one person. Assassinations are also a form of terrorism. The man who killed Yitzhak Rabin in 1995 was a terrorist - he wanted to stop the peace agreement between Israelis and Palestinians. Godse, who killed Gandhi, was also a terrorist. He despised Gandhi for fasting to protect Muslims.