Sydney knows about the aura which is the first step in resisting it. It’s like disbelieving an illusion. We’ve seen that her ADHD can be an asset in some cases, but here it’s working against her, as we see her slip from active resistance to “yeah and so’s you’re mom!” in about 4 seconds.
I always knew this step of the plan would fail, in fact I’m not even sure what Sydney had planned for the lighthook. There’s a lot of options; wrap it around his arm to see if that will block the lightning, try and choke him, shove it down or up certain orifices, even make a spring to try and push him off Max. Sydney doesn’t even know if it works that way yet. She’s not the Green Lantern after all. Well, hopefully she can turn it around on the next page.