Why did we go through all the trouble to kill Skolas, just for the queen to say "Nah" at the last second and capture him in a futuristic tractor beam thingy? Then the queen decides, "Ya know what, screw this" and lets us kill him with a bunch of adds and servitors and bombs? What was she thinking!? Did she say "Yeah, these Guardians are anti-social. This is a good idea..."? Seriously, any explanations (even ridiculous ones will do)
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I would assume that once captured she got whatever information she required out of him then let us at him again. Ultimately, she gave Skolas to the Nine, they released him, she needed to find out why.