The solar transition region is a unique laboratory for astrophysical reconnection, owing to its high emission measure, short line of sight integration, and high event rate as compared to the corona. We report a well-resolved explosive event in the solar transition region observed by IRIS, Hinode, and SDO as part of IHOP 252 on April 15, 2014. The event is resolved spatially and temporally in Si iv slit jaw images as a series of brightenings in a bundle of pre-existing loops. In the spectra we see a complex, evolving velocity field indicated by blueshifts, redshifts, and nonthermal line broadenings. Imaging from XRT and AIA shows nearly simultaneous manifestation in all bands, suggesting localized heating. The evidence leads us to conclude that magnetic energy is being converted rapidly to kinetic energy in this event. We discuss the possibility that this is a direct observation of tearing mode reconnection in a transition region current sheet. The combination of multithermal, high resolution imaging and spectroscopy makes this a compelling case for a possible tearing mode in the solar atmosphere.