Here is an exerpt from the Apollo Lunar Surface Journal of the discussion surrounding the hammer throw:
170:29:44 Schmitt: Let me have your camera (to put in the ETB). Go ahead (and talk). (Noticing that Gene is about to throw the hammer) Oh, the poor little...Let me throw the hammer.
170:29:48 Cernan: Okay.
170:29:49 Schmitt: Let me throw the hammer? Please.
170:29:50 Cernan: It's all yours.
170:29:51 Schmitt: You got the gravimeter
170:29:52 Cernan: You deserve it. A hammer thrower...You're a geologist. You ought to be able to throw it.
170:29:56 Schmitt: You ready?
170:29:57 Cernan: Go ahead.
170:29:58 Schmitt: You ready for this? Ready for this?
170:30:00 Cernan: Yeah. Don't hit the LM. Or the ALSEP. (Pause)
[Jack throws the hammer with a discus motion. It is visible against the sky for a long time. Gene's picture of Jack, AS17-143-21941 may have been taken just after he threw the hammer.]
170:30:07Cernan: Look at that! Look at that! Look at that!
170:30:12 Schmitt: Beautiful.
170:30:14 Cernan: Looked like it was going a million miles, but it really didn't.
170:30:17 Schmitt: Didn't it?