Debris flows and similar flow-like mass movements endanger communities, structures, and facilities. In the last decades, propagation scenarios have been more finely computed as novel approaches, depth-integrated or even fully 3D, have been conceived. More problematic is the evaluation of debris flow interaction with materials, obstacles, and structures along the propagation path. However, some recent advances have been gained thanks to extensive experimental works at different scales, for instance, through tests in flume, centrifuge, or long slopes in the field. Combined with that, multi-phase multi-material large-displacement modelling approaches provided new insights. The hydro-mechanical coupling of pore water pressures with deformation/interaction mechanisms have been inspected more, and energy release and dissipation have been explored in impact-loading landslide cases, cascading scenarios up to landslide-structure interaction problems. These topics will be covered with examples inspired by recent experimental tests and catastrophic past landslide events.