In episode 4, Fudo motherfucking Zen returning to take charge of Neo-DEAVA, and convincing Mikono to help Amata pilot Aquarion as well as abolishing the rule preventing male and female students from interacting with each other.
Don't forget how this all happens amidst the resurgence of the Infinity Punch from the original series.
In episode 7, Yunoha soundly thwarts Jin's overwhelming laser attack by using her Element ability to render Aquarion unreactive to light, and therefore lasers, which is followed by Amata simply flying right up to Jin's mech and beating the ever-loving out of it with Aquarion's bare fists. It probably also helped that the full version of Kimi no Shinwa was playing over the course of the entire thing.
How did Donar lose his arms? During the Aquarion disaster, when his love was being whisked away, he held on to her so tight that his arms gave way before his grip did.