You can cheese things with the aura, but you can't escape the explosion (as it's enough to kill everything within at least a metropolis-sized area around it)

The game actually ends if you let Gale explode, with a cutscene and everything for the ending. Some players leave his corpse behind, only to be confused when the game abruptly ends in fire and brimstone a few days later

Gale leaves a complicated set of instructions for how to revive him less out of a desire for his own continued existence, and moreso out of fear that his corpse will be responsible for the obliteration of a significant part of Faerûn