The Problem:
The third sentence of the Razor Swarms base system says (emphasis mine):
Hostile characters start their turn at least partially within the area or move into it for the first time in a round take 2/4/6 [Burn].
The main verb of the sentence is "take", and "start their turn at least partially within the area or move into it for the first time in a round" is actually a descriptor explaining which hostile characters take Burn. There's a missing word before that phrase, causing the sentence to be grammatically incorrect.
The Solution:
It should read (emphasis mine):
Hostile characters that start their turn at least partially within the area or move into it for the first time in a round take 2/4/6 [Burn].
The Location:
Razor Swarms base system for the Hive NPC, in the bottom left of p. 302 (in the GM's Toolkit chapter of the premium PDF).
The Problem: The third sentence of the Razor Swarms base system says (emphasis mine):
The main verb of the sentence is "take", and "start their turn at least partially within the area or move into it for the first time in a round" is actually a descriptor explaining which hostile characters take Burn. There's a missing word before that phrase, causing the sentence to be grammatically incorrect.
The Solution: It should read (emphasis mine):
The Location: Razor Swarms base system for the Hive NPC, in the bottom left of p. 302 (in the GM's Toolkit chapter of the premium PDF).