He does, read on.
It seems like you are trying to really stretch it. Grapple is designed for grabbing and hanging onto an opponent. Tumbling and Jump are not designed for that at all.
The “logical” solution is to use grapple.
Jumping makes no sense whatsoever when you are discussing a halfling versus a giant’s back and Tumbling would be slightly ok to avoid a movement AoO if dropping on the Giant’s back from above, but it should do nothing to prevent the AoO that an unarmed attack on a creature provokes and it shouldn’t be used to help a halfling launch himself 8+ feet into the air.
Point conceded. Grapple it is.
Fairly complex and ignores core rules.
Fairly complex?
It ignores the fact that 3E has no facing, hence, the halfling really cannot run up the back of the Giant without the Giant simultaneously turning in his space and facing the halfling to prevent it.
This is a gray area. I know there's no facing in 3E, but things happen. You can't just prevent someone from doing this because 'there's no facing in 3E'. It should, as is, possible. And when this happens, unfortuneately, facing pops into play since the giant can't see his back. This is different than a rogue saying, "I walk up to the giant and stab him in the back."
I think what is bothering you about using grapple is that the Giant will almost always kick the snot out of the halfling when doing it. But, that’s what Giant’s do.
Yes, but read on...
You should not allow the description of the combat maneuver to take this out of the realm of combat and place it into the realm of skills. Skills are fine to perform certain tasks during combat, but they should not be used to grab onto and hold an opponent, even if the character is using a magical item to assist him. That should be a combat maneuver, just like tripping, overbearing, bull rushing, or any other form of non-weapon combat maneuver.
I agree. Let's use grapple. After rereading grapple rules again, it became clearer to me. So, the giant gets his AoO on the halfling, and if successful, the grapple fails. If not, the halfling gets to make a melee touch attack, and if successful, he's on his way up the giant's legs. The halfling doesn't need to make a Hold, just a grab. And, it's a good thing, since he automatically fails a Hold check vs. large creatures. Now, facing comes into play, so the DM rules here on what, if any, modifiers come into play.
So, using grapple isn't actually as hard as I thought it was. Using it while the giant is flat-footed, or when he's already used his AoO for the round could make this maneuver fairly simple. Unless he has Combat Reflexes that is.
While I'm here, how do you rule sneak attacks vs. giants? By the rules, no vital areas are in limbs, so no sneak attack. Apparently, veins, arteries, and achilles heel are not vital. So, by the letter of the rules, small pc's can only sneak attack giants with ranged weapons, or by using a technique like the one presented in this thread. Or, by using a reach weapon I suppose.