I watch this video from the year I was born A LOT. I'm beyond impressed with the standstill at the start from the Czech tandem. Check out how the Brits manage to control the bike even after the front spokes have been ripped out.
The announcer says "Man behind provides the power. The rider at the front provides the skill and expertise and guides the tandem around. It really takes a courageous man to sit at the back in a tandem sprint."
I've been in both seats on my tandem and agree that it can be pretty scary at the back. It takes a while to get used to the fact that you have no control and I still try and reach for brakes sometimes. Also your view is limited which can be a good thing sometimes, depending on your pilot.
When my friends and I go on long group rides, we usually appoint whoever is on the back of the tandem to be head of communications. They have freer hands to answer phones, take pictures, and are able to look around and see how everyone is doing or if anyone is missing.
I've been on the front with someone stronger than me on the back and that is really scary. I can only compare it to the part in action films when the bad guy puts their foot down on the accelerator while the hostage steers.
Anyway, I better get back to practising my tandem standstills. I'll let you know how that works out for me.