  Two types of penetrating probes, direct photon and QCD jets, are investigated
in the background of a small and rapidly expanding droplet of quark-gluon
plasma. The additional thermal electromagnetic radiation results in a
$\sim$50\% enhancement of the direct photons. In high multiplicity p+Pb
collisions, jets can lose a sizeable fraction of their initial energy, leading
to a charged hadron $R_\mathrm{pA}$ of $\sim$0.8 at a transverse momentum
around 10\,GeV. Those two proposed measurements can help understand the
apparent collective behaviour observed in small collision systems.
