If you spec any damage reduction on weightless that'll help. While in weightless I pop the slow flask in case escape is a better option. Standard attack and heal. About four hits should do it.
When solo tanking (strength of stone, playing god, unfeeling) combo makes you unkillable. You murder deployables on capture point without bulldozer. Vs slow use (It follows) Vs cc use (Forsaken) keep chopping at full movement speed. chop chop chop
Khan's Ultimate will throw Terminus away. If he has Shatterfall he can stop the momentum. He needs cc reduction 70% to do this. Instead be near a ledge before you grab him then aim diagonally down offstage to guarantee Terminus dies.