Assuming no monsters take actions, the party takes a few rounds to heal the paladin, lift the portcullis all the way and prop it up with the standard issue 10' pole, retrieved from the party's bag of holding, then repeats the process on the next, after the rogue takes her time to disable the series of traps. If Torvax doesn't interfere, they store the elf in the bag, then cautiously proceed, the rogue taking point to search for traps.