How exactly do spells stack?

[SaintNicholas]

<DIV>I'm a level 29 templar on the Permafrost server.  I've been playing around with the spells intercession, supplicants prayer, and BoV, and trying to figure out how they stack.  It seems like most of the time when I cast BoV and supplicants prayer on someone it uses all of BoV, then supplicants prayer, not using them at the same time.  But then sometimes it seems to use both of them at the same time, and especially when I cast intercession it seems to use at least 2 of them at once.  This might be becuase the tank is getting hit really fast and I just can't tell the difference, so I was looking for some clarification.  Do they stack as in both can be on 1 person but they don't work at the same time, or do they work on top of each other? </DIV>

[Lifewast]

Single target vitaes (BOV + SP) stack on the player, but only one or other triggers a heal at a time....Group vitaes are likewise (sermon + intercession) , only one or other will tick at a time...Group + Single will tick at the same time thus increasing total heal per tick So, you could actually stack sermon/intercession/BOV/SP all at once.... then for the first 4 ticks it will trigger maybe intercession+SP , the second 8 ticks intercession+BOV , then last 8 ticks will come from Sermon....etc (it wont come out exactly like that since they will trigger randomly)Most efficient will probably be just Intercession + either BOV or SP in turn.

[Xran]

I wonder if they allow sermon/intercession + BOV/SP stack AND all 4 tick at the same time = overpowering?