We've done this mission about five times before and as we both recall we have to defeat the strand guy, which we did, then they go into the force field just like the stasis guy. Both in the tubes, now we kill the wizards and move onto the clock step. The wizards couldn't be damaged either way. I was light and he was dark, both not damaging the respective wizards. It basically forced us to run out of time, nullifying the entire mission and us not getting the class item at the end. I really hope we are missing a step here so we don't run into it again, we actually love this mission. It just doesn't feel great to lose a chunk of time just to find out at the end we couldn't beat it.