The way I see it, striations in the bevel are running from tip toward heel like this from X pattern honing (edge on left, spine on right):
Tip
/
/
/
Heel
Unless I've completely misinterpreted X pattern stropping for the last 2 years (entirely possible, I might add

), if a strop were to impart microscopic marks on the edge, they would look like:
Tip
\
\
\
Heel
So to me it looks like X pattern stropping is an "against the grain" process.