What conditions are required for a member of the Way of Blue to be able to summon a Blue Sentinel for help (via Covenant perk)? Does soul memory take part in this?
Additionally, will a help summon be triggered if:
- the Way of Blue member summons an invasion via a Red Soapstone Summon Sign?
- the Way of Blue member gets invaded by Bellkeepers?
- even if the Way of Blue member already has one White Phantom (xor one Shade) summoned?