For Ring of Shooting Stars, can Ball Lightning affect a creature when you move it into their space?

The Ring of Shooting Stars has the following feature (emphasis mine):

Ball Lightning.

You can expend 2 charges as an action to create one to four 3-foot-diameter spheres of lightning. The more spheres you create, the less powerful each sphere is individually.

Each sphere appears in an unoccupied space you can see within 120 feet of you. The spheres last as long as you concentrate (as if concentrating on a spell), up to 1 minute. Each sphere sheds dim light in a 30-foot radius.

As a bonus action, you can move each sphere up to 30 feet, but no farther than 120 feet away from you. When a creature other than you comes within 5 feet of a sphere, the sphere discharges lightning at that creature and disappears. That creature must make a DC 15 Dexterity saving throw. On a failed save, the creature takes lightning damage based on the number of spheres you created. (4 spheres = 2d4, 3 spheres = 2d6, 2 spheres = 5d4, 1 sphere = 4d12)

Does this mean that the sphere discharges lightning whether you move it within 5 feet of a creature or whether a creature moves within 5 feet of it?

What happens if you move it within 5 feet of multiple creatures at once (or multiple creatures move within 5 feet of it at once)?

Shooting through a large creature

I was wondering if I could shoot through a large creature like the image below? enter image description here

On the right image, one of the players insists that a large creature shouldn’t be able to fill up the 10x10ft space, therefore should still be able to shoot through the large creature (orange) and hit the red for maybe 3/4 cover (+5 AC).

What do you guys think?

Can the motes of the Ring of Shooting Star’s “Shooting Star” effect be layered?

The Ring of Shooting Stars has the Shooting Star effect as described below:

Shooting Stars. You can expend 1 to 3 charges as an action. For every charge you expend, you launch a glowing mote of light from the ring at a point you can see within 60 feet of you. Each creature within a 15-foot cube originating from that point is showered in sparks and must make a DC15 Dexterity saving throw taking 5d4 fire damage on a failed save, or half as much damage on a successful one.

My question is can the motes be layered on top of each other to form a cube, wherein each creature must make 3 x DC15 Dexterity saving throws and be subject to 15d4 (modified by the saving throws) damage?

Do the ball lightning and spark shower functions of a Ring of Shooting Stars allow saving throws?

In the SRD it states:

The first special function, ball lightning, releases one to four balls of lightning (ring wearer’s choice). These glowing globes resemble dancing lights, and the ring wearer controls them in the same fashion (see the dancing lights spell description). The spheres have a 120-foot range and a duration of 4 rounds. They can be moved at 120 feet per round. Each sphere is about 3 feet in diameter, and any creature who comes within 5 feet of one causes its charge to dissipate, taking electricity damage in the process according to the number of balls created.

It also states:

The spark shower is a flying cloud of sizzling purple sparks that fan out from the ring for a distance of 20 feet in an arc 10 feet wide. Creatures within this area take 2d8 points of damage each if not wearing metal armor or carrying a metal weapon. Those wearing metal armor and/or carrying a metal weapon take 4d8 points of damage.

http://www.d20srd.org/srd/magicItems/rings.htm#shootingStars

Neither of these functions directly address a need to either make a saving throw or the requirement to make a ranged attack to hit a target. Should these functions require either saving throws or attack rolls?

For the Ring of Shooting Stars, what is the spell save DC of Faerie Fire?

The Ring of Shooting Stars has the following feature:

Faerie Fire. You can expend 1 charge as an action to cast faerie fire from the ring.

Since it does not specifically state that you use your spell save DC or list a spell save DC (unlike its Ball Lightning or Shooting Stars features), what is its spell save DC?

Difficulty shooting in high ISO with my Canon 5D Mark II

While trying to shooting at 2500 ISO in a dark music jam, when I push the shutter it just stays open, the plus/minus exposure dial through the lens flips to far left, and I have to change the setting to make the shutter finish.. then no shot… do I have wrong settings somewhere that is causing this.? I have a 35mm 1:1.4 lens attached…Canon