 In his translation of the Prose Edda , Henry Adams Bellows comments that the Grímnismál stanza mentioning Thor and the bridge stanza may mean that " Thor has to go on foot in the last days of the destruction , when the bridge is burning . Another interpretation , however , is that when Thor leaves the heavens ( i.e. , when a thunder @-@ storm is over ) the rainbow @-@ bridge becomes hot in the sun . " 
