$MSTR DIAGONAL 260618/260515 CALL 250.0/CALL 175.0$ Rolled away as I was assigned at 298 and my call was at 175. I did not expect the sudden jump in the counter and I am sure no one did. My original plan was to ladder the call strike after each expiry upwards as the underlying moved up to reach the buy price. However the copy yet went up too fast and I have to roll at a loss to nearer my buy price .