Originally Posted by RockSP
Arrows wouldn't have any effect on the Hulk, so if that was part of an early script that's probably why they cut it out. Or Renner might have just been joking.
I just recently found out that the tranq arrow is mentioned on the bio for Hawkeye's Marvel Select figure. According to the bio, Hawkeye was Shield's secret weapon to taking down the Hulk. Hawkeye was recruited into the Avengers Initiative for this reason. He was supposed to keep an eye on Banner.