I'm going to bring this up now for the record.
Ignoring the fact that ZOMG RIZA CAN SHOOT FIRE FROM HER SPINE BECAUSE ROY LIEK TOTALLY LURVES HER, that image on Hawkeye's back looks an awful lot like the sigils Ed saw at the ruins of Xerxes.
...the ruins that got that way because of
Riza might be Pride?
Discuss. Bitchslap me. Whatever. I said it.
EDIT: Never called it an Oroborus, kids. Chill. xD