Rapid spectral changes seen during a Swift snapshot taken on 1 January 2016 (OBS ID: 00031403134). The green spectrum was extracted during the first 590 s of the observation (JF2a), the orange spectrum is the WT mode segment covering the 120 s duration flare (JF2b), and the purple spectrum was taken during a 480 s segment posterior to the flare (JF2c). The variability can be nicely described by a rapid uncovering of the intrinsic emission. Similar variability was also seen in the June outburst (see Motta et al. 2017a, Fig. 3).