The passes in blue are optional.  If you decide to do them, you may choose either to make a normal pass (trying to avoid hitting the person between you and your partner, as well as a nearly inevitable collision) or to make all passes in doubles (not crossing), which adds a nice visual effect (and simplifies the pattern) even if certain purists don't like the resulting dead time.  

Rhythms:
4-count in both cases (it can be done in 6-count to simplify things in the version without the blue passes).  Jugglers gone mad may try other, faster rhythms. 

Resources