Thrall herd character and telekinetic force questions

Note: I found a similar question re: Telekinetic Force. People who replied said that at-will spell like abilities need to be limited when used for damage, but I'm not sure how I would do that in this particular case. I hope this isn't considered a repost.

In my campaign, there is a player that has created a psionic character Thrall herd class using psionics unleashed. He is using a psionic power called telekinetic force in a weird way that I'm not sure is legal.

First he has hoarded a massive amount of greatswords found littered in dungeons. None of them are magical. He keeps about 8 of them sheathed and strapped on his person. In his opening move, he uses Telekinetic Force to shotgun blast an enemy with all of them at once (he initially wanted to swing standard attacks with each one on each turn but I overruled it). At first, I didn'the believe that Telekinetic Force could be used for attacks, but there is a paragraph explaining the rules for attack rolls for throwing objects in the ability description. Then I thought that there was a limit to how many great swords he can launch, but that doesn't seem to be a limit for the ability either.

We've played a few sessions with it and i've found that an easy way to get around this is to give enemies damage resistance, but this makes enemies significantly harder for the rest of the group. I've also ruled that he can use that ability only once per fight since he would have to collect his swords to use it again.

I really can't understand why this would be legal, but I can't find a rule passage to challenge it. I'd rather not flex my DM muscle to limit his character yet again, because in his mind he's following the rules. Help?

Telekinetic Force is a power that costs 5 power points per use. So it is limited by the amount of points he has. What is his base class that he is advancing? Thrall Herd is a prestige class.

He can throw one object per caster level, and they only do weapon damage if they hit. So if he is throwing greatswords they deal 2d6 damage each. Each requires a separate ranged attack roll, though they use his casting stat instead of DEX.

Telekinetic Force is a power that costs 5 power points per use. So it is limited by the amount of points he has. What is his base class that he is advancing? Thrall Herd is a prestige class.

He can throw one object per caster level, and they only do weapon damage if they hit. So if he is throwing greatswords they deal 2d6 damage each. Each requires a separate ranged attack roll, though they use his casting stat instead of DEX.

Forgot to mention the base class. He's a psion. Would that be 5 points per object thrown, or per use of the power? If it's per object thrown, it would severely limit how often he could use it

It's 5 points per casting of the spell. The spell has 2 modes, move and thrust. If you use the thrust option, which your player is using to throw the greatswords, the spell has a duration of instantaneous. So it's 5 points every time he throws the 8 swords. What level is he? I would assume he is level 9 as he loses a caster level for leveling in thrallherd.

Note that the Telekinetic Force power is not much different than the Telekinesis spell (it's just of a lower level). As long as the weight of the object is within the specs of the power (per level), what they are doing is legit.

However, remember to apply encumbrance to the character in between encounters.

Additionally, if he is using non-magical greatswords, and they are being "shot", then DR would apply.

Moreover, given that greatswords aren't piercing damage-type, you could apply a damage penalty due to using a method of applying damage different than that of the weapon itself.