This board is one giant deception by someone who wanted to write a perfect crime, also memes.
The culprit is Fenris, even if it was not intentional at all.
The night before, Beowulf entered the unlocked apartment and planted the blood from his leg on the floor (possibly all of it, certainly at least the one between the two doors). Wolfgang missed this blood when he left, having just woken up, also the rooms were dark.
Beowulf stole a ton of silver, specifically for this trick. His accomplice Lykos helped him prepare for this trick and started blatantly telling Wolfgang bs about the pendant. Beowulf rode the wheel, and intentionally dropped the silver to give Wolfgang a hint (remember, this is a mystery fiction), as expected Wolfgang returned to the booth and made the cabin ascend.
When he was at the top, Beowulf moved all the weight to one side of the cabin (his body, the silver and the coins, there were probably a lot more), so the cabin slowly started spinning by itself because of the weight, and reached the bottom, then Lykos freed Wolfgang, and they took all the silver out. Notice how they did this while Wolfgang was distracted by Geri and Freki, and the perfume was to mask Beowulf’s scent.
Beowulf quickly made his way to Wolfgang’s apartment, while the third tenant entered it with a mask at 7:06, a pandemic is going on (or they were bribed). When Beowulf reached the apartment, he noticed the blood on the floor since he was looking down, and unlocked the door. While Wolfgang was distracted, waiting for Fenris, Beowulf entered the apartment and took the kitchen knife, then he went to the door to set the chain...
It would all be good, but when Fenris tries to open the chained door, Beowulf is holding the knife, and his hand is accidentally pushed so that he stabs himself, afterall he had entered something like 15 seconds earlier, he was still setting stuff up, It doesn’t help that right after that, Fenris destroys the door, launching Beowulf into the room and sinking the knife way deeper in.
Meeting Fenris there really was unfortunate in the end.