User blog comment:Tekkphreke/Blut Vene and Blut Arterie/@comment-26420452-20131213073117

Blut Arterie and Blut Vene are kind of passive abilities and the Sternritter seem to be using them without telling things "Surprised you didn't hurt me at all? It's because of my Blut Vene." or "You didn't expect my attack to be that strong? It's because of my Blut Arterie".

And they also can switch almost immediately between the two, just like Urahara had predicted by its analysis. Quilge was forced to only use Blut Vene because he couldn't be a match to Ichigo's Tensa Zangetsu-inhanced speed. However, the other Sternritters so far haven't had any speed problems, so here they are, wiping the floor with the Shinigami.

And unless Kubo changes his mind, Blut Arterie and Blut Vene can't be used at the same time.