To understand in more detail the dynamics around the two CoIns, we picked from the ensemble of initial conditions used to run AIMS/SA-2-CASSCF dynamics one that hits the sloped CoIns and gives the highest reflection from S 0 to S 1 (IC15) and one the decays completely to the ground state after evolving around the peaked CoIn (IC8). In both cases, the dynamics are initiated with zero momentum. CASSCF dynamics show quite different ultrafast dynamics around the two CoIns with respect to the CASPT2 ones. When starting from IC8 (Figure ), the wavepacket evolving on the CASSCF surface spawns after 8 fs the first time, and a fs after a second time, transferring completely population to the ground state. When the wavepacket propagates on any of the CASPT2 profiles, it does not encounter the peaked CoIn, never entering a spawning region in the first 40 fs. By looking at the relative energies between S 0 and S 1 (Figure ), we can confirm how the two surfaces cross twice along the CASSCF profile, while they never intersect in any of the CASPT2 flavors. Consequently, the magnitude of the TDC is proximal to zero in these dynamics, while quite high in the CASSCF, promoting the generation of the child trajectories (Figure ). Propagating IC15 (Figure ), different CASPT2 flavors led to different dynamics, although an overall trend and common from the CASSCF one can be seen. In the latter, the wavepacket evolving on S 1 spawns twice in a few fs, analogously to IC8, but the first child spawns at 14 fs inducing a transfer of population back to S 1 of almost 40% of the total population.