If Sonnia casts Flame Wall, can a totem who is activated simulataneously as a companion also cast Flame Wall via magical extension, given that Flame Wall can only be cast once per activation? I'm presuming not, but clarification would be very helpful here.
In addition, what constitutes an activation is a little unclear here: can a totem cast Flame Wall in the same activation phase if not activated simultaneouly if Sonnis has already cast it?
Thanks in advance.