Mount up high enough to receive some falling damage when would attack from mid-air, then target your victem and cast a spell from mid air (only instant casts obviuosly, but you don't need to damage him)
This way the Transporter will just hang a few feet above ground and he won't attack you.
When i receive less than 500 damage they will attack, so i guess you gotta figure out for yourself how much falling damage you must take, i have 11k hp.