Abstract: Massive-star feedback at low metallicity may vary dramatically from the classical, thermal energy-driven model at solar metallicity. I show that weak stellar winds and fewer supernovae promote conditions for classical feedback to be dominated by radiation, rather than mechanical power. This could play an important role in the escape of Lyman continuum radiation and also explain various phenomena, including the properties of Lyman continuum emitters. I present observational evidence of strong radiative cooling and Lyman continuum-driven feedback in the local starburst Mrk 71 and other objects.