losing control of throw in

[BillyMac]

Originally Posted by bucky

... During an inbound, they would have to return to the original place and begin again ...

Are you saying that the inbounder can legally leave the designated spot to retrieve the fumbled ball but must then return to the designated spot to make the throwin?

Not by rule:

7-6-3: The thrower shall not leave the designated throw-in spot until
the ball has been released on a throw-in pass. See 4-42-6.

4-42-6: The designated throw-in spot is 3 feet wide with no depth -
limitation and is established and signaled by the official prior to putting the
ball at the thrower’s disposal.
NOTE: The thrower must keep one foot on or over the designated spot
until the ball is released. The traveling and dribbling rules are not in effect
for a throw-in.

When he leaves the designated spot, sound the whistle.