The 6th Global

[Zylithan]

sounds like two were cast at the same time, right?

could the computer logic be:

if global cast..
see if 5 already
if so, remove one
add new global(s)

and somehow both globals go into the list, but only remove one?

[NTJedi]

I'm in a 3.10 game at this moment... 5 globals were active and at the start of the next turn 3 new globals were casted successfully. The end result was 5 active globals.
I'm not sure what combination provides 6 globals, but I'm sure some of the hardcore gamers are hunting for the secret combination.