Communions question

[bbz]

Hello, I have been trying to figure out the mysteries of communions lately, and as with every mystery you need to start from the basics. I read a guide by Baalz on the topic but something is bothering me. In the guide it is said that:

"Slaves boost the power of both slaves and masters inside the communion by 1 per power of 2. This means +1 at 2 slaves, +2 at 4, +3 at 8"

So i decided to try that. I used four S1 casters set on "communion slave, soul slay X 4" and 1 S2 communion master set on "communion master, enslave mind X4 "
By the statement above the communion slaves should get a boost to their astral level so that they should become S3, in reality though they didn't (in my tests)
so they were unable to cast soul slay.

So how is actually the magic level boosted for the communion slaves?

One possible explanation is they are boosted only for the fatigue calculations of the spell the master casts, but not for the actual casting process.


Edit: Hmm its me not reading properly again: "Note, the communion bonus does not affect slaves casting by themselves, only the buffs the masters cast help. Apparently the slaves are acting by themselves outside the communion."