This paper investigates Dirac fermions in a nonsymmorphic Kondo lattice system CeAgSb2 using ARPES and calculations. It finds distinct Dirac cones at high symmetry points protected by nonsymmorphic symmetry, as well as a diamond-shaped nodal line. The Dirac bands have unusually high, linear dispersion and form a 'kink' due to hybridization with correlated Ce 4f states, ...