The formation of high mass stars is less well understood than that of lower mass stars due to the shorter time scales and larger distances involved. One of the earli­est stages of high mass star formation consists of a period of outflow which can be studied through its impact on its environment. We present observations of W28A2, a shell like Ultracompact HII region associated with one of the youngest and most energetic outflows in the Galaxy (05 star). Using the James Clerk Maxwell Tele­scope, we have observed the outflow in a number of transitions and have derived the age, mass, extent, and velocity of the outflow. In order to better constrain the driving mechanism of the outflow, we have conducted magneto-hydrodynamic simu­lations (using Zeus-MP and Jetget) of a high-velocity jet impacting on a surrounding molecular envelope.