We explore the possibility of enhancing the sensitivity of the HAWC gamma ray observatory to transient phenomena in the sub-TeV range by applying a fast and simple track finder on very low-energy, low-multiplicity events. The algorithm searches for low multiplicity events (three PMTs in different tanks in time coincidence) in a sliding time window and combines all tracks from all combinations of three tanks per time window to form a time-dependent significance map of the sky. Even with reduced angular resolution and no gamma/hadron separation capability, the method can potentially increase the sensitivity of HAWC to lower energy transients. The algorithm is simple and fast enough to be applied online during data acquisition. Using simulated events, we estimate the effective area and point response of HAWC using this algorithm, and discuss the feasibility of its implementation.