I've worked out a houserule, but is there any official ruling on what happens in BESM 3rd edition to your EP or HP total when your stats change? For example, if you drain someone's Mind score and boost your own, your EP cap raises; does your current EP total rise to meet it? If you have your Mind score drained, your EP cap lowers; does your current EP total lower as well?
It is mentioned in the Alternate Form attribute, p19 (emphasis mine):
While it is in the Alternate Form attribute, this would logically apply to anything that changes your stats.