Zoom-in of Fig. 1 showing three brief partial crossings of the HCS just before full HCS 2 crossing. The parameters are the same as in Fig. 2. In panel c, the red traces are the Walén predicted V_R, computed starting from both left and right edges of each partial crossing, and ending in the middle. The three partial crossings detected enhanced V_R (antisunward) jets and strahl electron dropouts indicative of magnetic disconnection from the Sun. Separatrix layers were clearly observed adjacent to partial crossing 1, only on the right side of partial crossing 2, and not apparent at partial crossing 3. The blue vertical dashed lines mark the edges of current sheet, where B_R starts to deviate from its asymptotic value.