You could deduce all that from looking at a tiny mark on someone's shoulder?
i noticed one on a girl I know. obvious as can be. she had better delts than me, dide fitness competition maybe 5 years back.it was rather gross, these wide open holes. looked like she pinned that morning.
And he looks at you and see's you looking at his shoulder, then he looks at your shoulder and see's the same red dot mark. Then you make eye contact and imaginary brofist each other.