why would he be the bad guy?
just one kick! maybe he wants to keep walter from finding out about the past, to protect him? perhaps.
POSSIBLE SPOILER
On mark's route, walter's mom said that herbert finally came out of his room...well. There are many possibilities.
Spoiler
We found a blueprint similar to our necklace at Mark's house. (If I remember correctly)
Maybe Mark is using us and Herbert is trying to protect us. there are many possibilities
