Legions of Steel - can someone explain me this?

[Tifone]

Hello, I'm playing an hotseat test friendly game with some ppl and one trying kailasa is having a strange behaviour with a Yaksha.

He is set to Legions of Steel, Legions of Steel, spells. The spells are actually... flying shards so not that good, but we wanted to try a prot-enhanced first line of the big Bandars gorilla guys with armour and shield.

Well, the quality of the tactic is surely dubious but the problem is another. The Yaksha casts the spell on the archers first, despite the bandars being closer, and then to the lonely markata scout prophet in the back, then just goes for the flying shards. He just ignores the Bandars, who surely need it more! I don't get the reason of this.

Prolly some of you might answer this without even giving a look to the battle (I have probably misunderstood the nature of the spell?), still I post it so you can see yourself eventually. Latest patch and CBM required.

Thanks for any help