yes, it is a penalty that occurs on a point after touchdown attempt when a player uses another player( teammate) in an attempt to propel himself higher to block the kick.
Yes. Spiking the ball to celebrate a big play is usually an automatic "Delay of Game" penalty. However there is an exception to allow the player to spike the ball after a touchdown.
Same time as tackle football, when a player gets in the end zone with the football, but usually its not a rushing touchdown in flag football.
The goal of football is to move the ball down the field and into the end zone for a touchdown.
yes
yes?
boo who
Another football is brought out to continue gameplay.
Nothing. This happens more than you may think. Many players keep the football when it is a particularly meaningful touchdown to them (like their first or a record breaking touchdown).
Thermal
any player on the offensive team
no