  At colliders massive long-lived charged particles could be revealed through
their anomalously large ionisation energy loss $dE/dx$. In this paper we
explore a class of scenarios in which the LLPs are particularly boosted, owing
to production from the decay of a heavy parent resonance. Such scenarios give
rise to unique signatures as compared to traditionally considered $dE/dx$
new-physics benchmarks. We demonstrate that this class of models, unlike
traditional new-physics theories, can explain the recently reported excess of
events in the $dE/dx$ search by the ATLAS collaboration without conflicting
with the determination of $\beta$ from ionisation and time-of-flight
measurements.
