Rally1 hybrid cars (2022-)

[1988senna]

Rally1 hybrid system explained by M-Sport:

https://youtu.be/-mbCJecCDr8

I'm not clear by this video for 2 point
1.if there have 80 kilometre with 4 stages to go and no service between the stage. how can the driver make the regen if the 100 KW used out

2.why the driver must use the EV mode .is that mean they will use more electrical energy from the battery? how can they have the advantage