Say you had a lossless transmission line that consists of an ideal source, a 50 ohm impedance, a 100 ohm impedance, and a 100 ohm terminator. The material is the same. You send a pulse down the line. When the pulse hits the impedance mismatch, you get a smaller reflection back, and a pulse bigger than the original pulse going toward the terminator. Since the material is the same, the pulse should have the same width (in space and time) as it did originally going down the line (prior to reflection) except now you have them where one is actually bigger than the initial pulse. How is energy reconciled in this case?