Therefore, a fold catastrophe describes this topographic event since one of the new CPs is not a saddle, ''jumping'' the reaction system between topographic regions with a difference in the CPs number equal to two. We agree with Silvi and coworkers that the simplest unfolding correctly describes the following three (simultaneous) changes since repellors m1, m2, and m3 and saddles s2b, s2c, and s2d collide and annihilate, respectively, as depicted in Figure . One of the most pivotal and intriguing events during this process is the division of the attractor a1 into a2, a3, and s1b. This event signals the beginning of the CC bond cleavage. For in-depth insights into the critical distances between carbons, we refer the reader to Ref. 29.