Sense of to exist, be present is attested from c.1300. Meaning to pay for as a treat is from 1821. Phrase stands to reason (1620) is from earlier stands (is constant) with reason. Phrase stand pat is originally from poker (1882); stand down in.
In Expert Mode, Wall of Flesh is seen to be significantly faster than his prior speed, posing map navigating harder as the players are demanded to plan out their routes fasters. In addition, getting pulled by his tongue will inflict additional damage to the player, possibly killing a weakened player.
Initially, they are attached to the Wall of Flesh, similar to Man Eaters in the Jungle, however, if The Hungry take enough damage, they detach from the Wall of Flesh and will chase the player. As the Wall of Flesh loses more and more health, several changes can be noticed.