Disconcerting the free thrower?

[SamIAm]

Originally posted by fan
Can I get some good examples of an opponent disconcerting the free thrower? I just want to find out what officials view as being unnacceptable behavior.
What is acceptable arm placement for players occupying lane spaces during a free throw? Is their a rule that says their arms must stay in their lane space or can their arms go into an opponents lane space?

Thanks

"MMMMMIIIIIISSSSSSSSSS-IITTTTTTT!
MMMIIISSSSSSSS-IITTTT!", said B1, while A1 was shooting a free-throw.