Spirit Healing (channeling at someone while channeling thaumaturgy) has been improved, taking into account how much thaumaturgy you are currently channeling. Hence, multiple preparations of thaumaturgy will multiply the amount of energy and healing the Spirit Healing grants per second.
For instance, prepping thaumaturgy twice and then channeling at someone will be doubly effective (though it will also be doubly as draining on the channeler).
Spirit Healing improvement
Spirit Healing improvement
[#GMCHAT] <Mirazia> I think you're enjoying this [mighty winter stuff] more than you realised
[#GMCHAT] <Rias> I AM AND IF THAT'S WRONG I DON'T WANT TO BE RIGHT
[#GMCHAT] <Rias> I AM AND IF THAT'S WRONG I DON'T WANT TO BE RIGHT