αἵματος ῥυέντος ἐκχλοιοῦνται → when the blood runs, they turn pale
gén. de ὑμεῖς.
genitive case of ὑμεῖς; of (from or concerning) you: ye, you, your (own, -selves).
ὑμῶν: gen. к ὑμεῖς.