"It is I / That, lying by the violet in the sun / do as the carrion does, not the flower / Corrupt with virtuous season."
Angelo, I imagine, head in hands, whilst finally admitting to his sins, longs for a land without the temptuous Isabella, the violet who blossoms before his very eyes, but at the same time he cannot contain his lust. It becomes imperative that he fulfils his long-ignored sexual needs; without this fulfilment he will rot, decay, disintegrate into nothing. It is easy to forget when reading or watching Measure for Measure that Angelo is not puritan, merely puritanical in his Catholic beliefs: Vienna was a completely Catholic city in 1604.
It seems wrong that Angelo and Isabella are cruelly parted by Vincentio's hasty unveiling. I longed for them to be together; Isabella's talk of whips and rubies seemed to suggest that she wanted it too. Let both of them throw their religious beliefs into the air; their morals are no more than screens for their sins. Isabella is already tainted. If it be her fate to have her chastity taken away anyway, let it be Angelo and not Vincentio that takes it from her!