Another item from the "A few bugs" mail. Casting spell of protection
when previous casting(s) hadn't timed out yet miscalculated the new AC
boost. At low levels--when this spell probably gets its most use--the
bug wasn't noticeable. (At high levels when someone might cast it a
whole bunch of times in succession, the effect could be noticed but
was probably just assumed to be working as intended. Its behavior is
somewhat convoluted.)
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