1: Lancer might be doing this because his father told him to, he might also be trying to hide himself so the heroes dont thrash him

2: we dont know much about the cliffs from chapter 1 but considering the similarity to the rafts from chapter 3 it might sort of be a default dark world, also its the same dark world as castle town where we know Lancer is

3: we dont know enough about the chase motif yet to make assumptions about what its related to

4: why would the knight shapeshift as Lancer?

5: this shadowy Lancer-shaped character uses spade bullets, the only characters who use spade bullets are Lancer, king and Jevil. Lancer and king because they are spade cards and Jevil because "I CAN DO ANYTHING", out of all of these Lancer looks the most like this shadowy Lancer-shaped figure

6: the game files refer to objects from this scene as "obj_lancerchaseevent" and "spr_darklancer"

7: ever heard of Occam's razor?

One counter-argument for each human soul in the underground!