From a bug report, making engulf time longer for high AC
didn't make sense for non-digestion attacks: taking longer to die from
being digested (high AC lets you last longer there) is much different from
being stuck inside a vortex or elemental and suffering extra buffettings
or whatever. Calculate swallow time differently for non-digestion than
for digestion. (The adjustment based around level 25 doesn't make much
sense either, but I left that in.)
If you survive total digestion via life saving, you get a message
about the monster not liking your taste. I don't think that's appropriate,
but haven't tried to figure out how to fix it.
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