This is a combat concept.
One of our primary concepts is that we defend angles of attack rather than worry about specific weapons or what style the attacker trains in.
The strike that comes in to the left side of your head is angle #1. You defend it with the appropriate block.
It doesn't matter if the attacker is:
a "street fighter" throwing a haymaker
a boxer throwing a hook
a karate stylist throwing a shuto
another stylist throwing a ridge hand
throwing a crane beak
throwing a "buffalo eyebrow"
or anything else
"Buffalo eyebrow" is of course made up. It's not a real technique (as far as we know!)
It provokes laughter when we cover this concept in class and that helps you remember it.