Before revision:  We identify the spin interplay between singlet state and three triplet states of radical due to Zeeman and hyperfine and examine the distinctive roles of nuclear and environmental decoherence from this perspective. Additionally, we revisit some of the earlier results concerning radical pair model from this fresh outlook and provide more comprehensive explanation to those. The approach is aimed to equip us more for solid state emulation of avian compass and design long coherehce time physical systems .
After revision:  We identify the spin interplay between singlet state and three triplet states of radical due to Zeeman and hyperfine and examine the distinctive roles of nuclear and environmental decoherence on it. Using a quantum information theoretic quantifier of coherence, we find that nuclear decoherence induces new structure in the spin dynamics without materially affecting the compass action; environmental decoherence, on the other hand, completely disrupts it .