We also look closer at the time evolution of these two coordinates along the two initial conditions chosen as representative for the two deactivation pathways above. In figure , we show the evolution of the C=CH 2 bond length and torsion angle over time for the entire branch of TBFs created from the two initial conditions with CASSCF and all flavors of CASPT2. Each newly spawned TBF is added at the point when it starts being forward They all show an initial elongation of the C=CH 2 bond beyond 1.5Å that also leads to the first spawning event; in contrast to CASSCF the spawn occurs however after the maximum elongation is reached. The population transfer to the spawned child differs greatly between the different CASPT2 flavors being more significant in MS and RMS-CASPT2, as also seen in figure . However, while in RMS-CASPT2, the child immediately transfers back population to the parent before independently evolving on the S 0 , in MS-CASPT2 the initial parent spawns another child TBF after a few femtoseconds and the two TBFs on the ground state evolve in each others vicinity in configuration space and exchange population with each other. Overall, the evolution in configuration space appears very similar between all CASPT2 flavors despite their large differences in population decay. While the CASSCF bundle evolves similarly along the C=CH 2 bond, the ground state TBFs undergo a much stronger torsion than the CASPT2 ground state. It is interesting to notice that despite the CoIn with higher torsion angles being predicted as having peaked topology, the evolution of the torsion angles between the branches of the two initial conditions show only minor differences in the torsion but seem to mainly differ in the C=CH 2 bond elongation.