A few things:

Everything is happening at once, and everyone can interfere in everything that is going on, whether or not it is directed specifically at you.

Lila has a choice here: she can succumb to the will of the ruby or she can fight it. The harder she fights, though, the more fiercely the ruby will fight for control.

Grom has many things on his back. Whatever you want may be found in the supplies that Kettle packed. Not that you have much time to rummage through bags. Also the spear and the pistol.