Canon event: Gideon gets her ass beat on a landing pad.
This happens later in Harrow Nova, now occurring the first night in Canaan House. To lay some groundwork, most Ninth cavaliers carry a pannier full of bones for their necromancer. Most also need at least one full bone to make a new skeleton. Since she could do it from a bone chip, Harrowhark never needed one. Gideon Navagraha's talents are no less impressive in their own way, but still need a whole bone. Unfortunately, as strong as Harrow Nova is, she is still very small. This puts a hard cap on how much she can realistically carry around, so Gideon has to carry her own.
In the excitement of landing at Canaan House, Gideon remembers her pannier but forgets her own personal satchel, including her prayer book (no way she has that shit memorized). After several embarrassing incidents, including Harrow lying that she's taken a vow of silence just to keep her from improvising the invocation, Gideon is in no mood by the time they settle in, especially when she finds out that Harrow knew she left it behind and didn't say anything out of spite. She storms out to go get her belongings as Harrow dozes off.
Gideon gets to the landing pad just as the skeletons are disposing of the shuttles. Thankfully, they haven't gotten to hers yet, so she runs for it before they shove it off the side. This leads to an altercation, and pretty soon every skeleton in Canaan House is dogpiling her. Of course, she left the pannier in her room. Of course she did.
She manages to find one bone that rolled under a seat, and from there makes the biggest, most anatomically inaccurate Home Depot/Spirit Halloween skeleton you've ever seen just to carve her a clear path through the horde. Beaten, bloody, robes torn to shreds, but bag in hand, she stumbles back to the room.
Of course, all of this happened entirely offscreen. From Harrow's perspective, she dozed off, woke up to a commotion up above, went back to sleep, and woke up again to Gideon staggering through the door looking like ten miles of bad road. By morning, all of her wounds have healed and Gideon refuses to talk about it because the last thing she wants to tell Harrow is that she got her ass kicked by skeletons.
Of course, someone probably saw the 20-foot tall skeleton on the landing pad. It's a lot easier to see than like 20 individual skeletons doing their work. They also noticed the shuttles were gone the next morning, and drew some very reasonable but incorrect conclusions....