The monster will always begin on the space marked as 1. It will move and note where it is during the rounds.
@DarkMesa As long as some of Rival can get LOS, it will be presumed she can take the shot. A lot of that is determined by simple role play, as you note what your character is doing. So, for instance, if she wanted to, she could "peek around the cliff-side, take her shot, and then get behind said cliff-side in one turn."
Characters can move as close to the monster as they want but cannot retreat back again in the same turn. The grid space you indicate traveling to is the one you will stay in for that turn. Pets are naturally faster creatures, so I presume they could go in for a melee, and then retreat again back to the initial space they started from. I really don't hold them to the same confines but I need to know where they retreat to, in that case, for damage purposes of course.
Quibbles riding Victoria...this is a gray area. To keep it simple I'd say Quibbles, while riding, or anyone using a critter as a mount, could go into melee and retreat again up to one grid space, which must be noted.
Also, Quibbles can only make 1 attack in the turn, and his pet can only make 1 attack in the turn. You can use any weapon you want, but you can't make two actions in one turn, so I will assume that:
Quibbles makes a successful attack in melee with the monster using his sword, and Victoria also made a successful attack with the guns while charging in. 2 Damage is dealt from the turn to the monster. They currently reside on the same space as the Wraith in grid space 1.
Also note that Stoic has a healing sentry drone set up. If you take damage but are within this field, the damage will be lessened. The Medgun when used, acts similarly to a shield from support, in that some damage is negated (presume you are being healed as you take damage...so damage is less). The medgun can be used on an assist roll of course and does NOT count as granting hearts on character sheets. Only Class Die success grants those, again which can be granted to anyone the medic chooses.