This wonderful strategy for dealing with the Titans in Eoful does not work at all inside the Titans Stronghold, which I assume is the reason why the poster's Archer in particular is unhappy about the difficulty of dealing with Titans.There the only alternative to a messy battle (which will probably include more than one instant death) is to use Invisibility to sneak past the Titans to the chest where the bow is located. It's usually not too hard if you remember where the chest is located and are patient about letting them get out of the way, although if that's the way you go it would be best if you could teleport out after you get the bow.
