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.
It is recommended that a player refrain from summoning the Wall of Flesh until he is ready and willing to engage in the challenges of Hardmode, as the switch from the regular game to the post-game content is irreversible. To summon the Wall of Flesh, you must throw a Guide Voodoo doll into the lava of the Underworld. Throwing the doll in any other lava pit will not summon Wall of Flesh. Upon throwing the Guide Voodoo doll in the lava, the guide will be killed, however he will respawn the next morning if an event isn't in progress.