when he spawns use mob speed to move him far away from the room. then turn off the speed and make him slow.
attack him until tarik spawns, when tarik spawns hit him without pet hack so he is aggro to your char not ur pet.
use your pet with ctrl+q and pet hack to almost kill dr labo while u stand away from your pet's attacks with tarik on you, get him as close to dead as possible, because you have to be able to finish in like 12 seconds.
once labo is basically dead in a couple more hits.
go and kill tarik then kill labo.
if its too complicated, get better hacks than can freeze tarik and keep labo moving.