Questioning the Valorium+ Charm Ring Of Bonds

1. Is the charm focusing on the front enemy like Horn of Victory? It's unclear since there's no information at all. Charms should have additional information on whether they're focusing on a single target, column, back/front row, or the whole enemy team. I wouldn't ask but nothing of this charm appears to work.

Additional information - 1-star skill: Increases the wearer's damage dealt by 34%, and reduces the target's DEF by 40% when attacking, with a 40% chance to freeze (Lv. 5) the enemy for 2 rounds and a 66% chance to ignore 50% of the target's DEF.

2- I've PK Battled multiple people. Not once, not twice but way more. I've never seen the charm stun anyone even if their healer/supports are killed/stunned by another hero.

3- I've seen Soulfire's skill "...reduces the target's DEF..." work when PK battled several people but again it seemed like the charm focused on a single target. Never saw the "Reduced DEF" red debuff text appear when using the Ring of Bonds.

Has anyone else been using the charm? Is it working as intended?