I think it's more fitting to let Lynn attack his Master rather than Lua. Sure, she could have exact revenge on the Scientist for what he has done to her family but letting Lynn handle it and watching him commit suicide (maybe not everyone's favorite way to let a villain die like that as it's seem they get off easy and with a quick death). The Scientist was definitely too broken and insane enough to do that, it makes sense he much rather go out in his own terms but at least gave something useful up in return after seeing that it's pointless on escaping.
I don't blame Lua for freezing up either, there would be too many thoughts running through her head and hearing that he figured out she can use a different power, she chose not to retaliate out of fear.
I think it's more fitting to let Lynn attack his Master rather than Lua. Sure, she could have exact revenge on the Scientist for what he has done to her family but letting Lynn handle it and watching him commit suicide (maybe not everyone's favorite way to let a villain die like that as it's seem they get off easy and with a quick death). The Scientist was definitely too broken and insane enough to do that, it makes sense he much rather go out in his own terms but at least gave something useful up in return after seeing that it's pointless on escaping.
I don't blame Lua for freezing up either, there would be too many thoughts running through her head and hearing that he figured out she can use a different power, she chose not to retaliate out of fear.