I think she is spinning around her pruning shears in her hand.
Yes, that's a flashback to Das Finale episode 1 @ 09:22, where Hana cuts the barbed wire to enter the Johannesburg of Ooarai. I debated on whether I should have included a TN for that, but in the end I just left it as is.
As the gunner, there are a lot of scenes where Hana's looking through the aiming reticle for the other flashback, so there's no specific scene to point to for that.
is a basic in the Isuzu StyleThat makes a lot of sense .....Now then, let's start today's flower arr-angement experience...Saori-san, you let a single petal fallEHH?
No way, you can see that!?
An ever-lasting battle-field
  
Even on the battlefield,
we arrange our flowers with peace of mind!Heh heh,
it's just a hunchMako-san,
no sleep-ingYukari-san,
don't be naughty, alright?Sheesh everyone,
if you're trembling too much you'll startle the flowers you knowAre you that afraid of being pricked?
There's no way to get a surprise attack on Hana~...