Or they could have had impact push bot (open inhib) while they let TSM have baron and then they could make them fight under a turret or simply trade an inhib for inhib and then live to fight another day...
no way Impact pushes all the way to inhib and takes it before TSM takes Baron and comes storming their base tack on the Elder Drag they had...no way would it be sane to let them take it and hope you don't crumble in base