>>534527358
It’s because Susie is a mix of human and monster.
The punch bowls at the church signify magic and blood. Because Gaster is both. Monster (Friend) and human (mystery man).

>>534260526
Because the Dragon is a mix of monster (yellow) and human (red).
The punch bowls represent this.
75% Yellow
25% Red
Dragon Scar

It’s just the dumb game interrupts it with Susie’s dialogue since it’s supposed to represent her. A complete oversight.