Dragons can still cast spells at you and use their roars after they have eaten you. They could also digest you with their own elemental damage type rather than ordinary digestion.
If a digesting engulfer eats an e monster that explodes (either actively or upon death) or potentially any monster with an explosion attack, the monster is assumed to explode inside the engulfer, who takes double damage from that attack (or 8 times damage, if the explosion is considered to have hit them 8 times) and is stunned and immobilized for a few turns, unless they resisted the explosion’s damage type in which case they only suffer that for 1 turn.
This should also extend to other explosions inside engulfers (most of these would be player-created: e.g. reading a scroll of fire or breaking a wand while engulfed).
When you’re in an engulfer with a digestion attack, the digestion attack hits every turn regardless of the monster’s actual speed. This is because most digesting engulfers are slow, and it takes way too long for their digestion to become actually threatening.
When you are hit by a digestion attack, any corpses you are carrying in open inventory may be instantly digested by the monster and disappear, or else become partially eaten. (If the corpse is a cockatrice corpse, it might stone itself, or maybe that wouldn’t happen because of all the stomach acid?)
Give giant mimics an engulf digest attack; they’re certainly large enough to swallow you in one gulp.
Trappers’ and lurkers’ above digestion happens much more quickly than purple worms, on a shorter timer. As it stands, most digestion attacks aren’t very threatening as an instadeath because the player almost always has time to kill the digester.
For that matter, all digestion attacks should probably be accelerated somewhat, even those of purple worms.
Yellow dragons digest the player much faster than the other types of dragon, because they’re all acidic.
Engulfing by a water elemental or a monster with a digestion attack cleans off any cream pie blinding the hero has.
