The relay ensures the efficient activation of challenging substrates, such as terminal allenamides, 12 by replacing the slower PC5-1a EnT (Figures 1a, entry 9-10, and 2a) with two faster ones. The scenario reminds the concept of polarity reversal catalysis in HAT reactions, in which a hydrogen abstraction step that has a poor rate is offset by two kinetically fast ones. Although extended aromatics have been used as triplet-state reservoirs, we are unaware of reports proving that the cooperation of two distinct EnT cycles increases the kinetic of substrate sensitization.