  The event-driven hybrid-pixel detector readout chip, Timepix3, has the
ability to simultaneously measure the time of an event on the nanosecond
timescale and the energy deposited in the sensor. However, the behaviour of the
system when two events are recorded in quick succession of each other on the
same pixel was not studied in detail previously. We present experimental
measurements, circuit simulations, and an empirical model for the impact of a
preceding event on this energy measurements, which can result in a loss as high
as 70~\%. Accounting for this effect enables more precise compensation,
particularly for phenomena like timewalk. This results in significant
improvements in time resolution -- in the best case, multiple tens of
nanoseconds -- when two events happen in rapid succession.
