Spam grenades
If there's a shield, that won't do much good at all to kill the important people. If there's a shield, try shooting everyone attending to see if there's a shield over the entire room. If there isn't, then we might as well
Spam grenades
and then drop down to the meeting room after the explosions have settled. If the speaker and such run, then we can try sending 2 team members after them and leave the other two to try and get the robotdexwhatever thing.
Though maybe grenades would be a bad idea because then it would give the people up on the stage a chance to escape....