It seemed that even while he was focused on grinding EXP on the masses of pixies, even while maintaining that absurd casting frequency, he was still watching her back. That, or it was pure chance that a lance happened to lock on, entirely possible given the rate of Lumi's spam.
That said, she chose to completely disregard the second possibility in favor of the first. It was better to imagine that Lumi was looking out for her specifically!
The lance of light may have missed, but it was still flying through the air. Lena's eyes flashed. It had homing properties, no? Then there was something she might be able to do. Lena reached out quickly and slapped the lance with her bare hand as it passed by.
"Ow!" She hadn't quite expected the harsh sting, pain exploded through her palm as the holy energy burned her skin.
[HP -23]
