>>716318025
The first cutscene (also used as a trailer for the game) where we see the BTs in Death Stranding 1 is amazing, and it shows everything that BTs are not in the actual game.

https://youtu.be/mLqVMF9s1Qc?t=210

In this cutscene the BTs are pro-active and actively search for humans and move around, they are for the most part invisible and only partially visible sometimes, showing a silhouette in the darkness, and they certainly don't feel predictable.

In the game though, you enter a BT section and they are almost inmobile or they follow a very set pattern, they never wander around so quickly and actively as long as you don't alert them, and if you do, they will stop after some time if you just don't move.

>>715354854
The explosion happens when Igor reaches the head of that giant BT at the end, the explosion does't happen when an invisible hand touches you or when the tar arms drag you away, the explosion happens when the "main body" makes contact with you, the main body in this case was that giant humanoid thing, but there are BTs of many shapes and sizes, like the lions, or the squids, or mantarrays, or the weird head thing picrel.