A Direct-Look Threat
Nightmare BB charges when you look directly at him for more than 2 seconds, so eye contact is the trigger.
Nightmare BB is the oversized Balloon Boy of the Frickbears 3 Mask Route nightmare sequence, and his whole gimmick is that looking straight at him kills you. If you searched nightmare bb frickbears, the answer is peripheral vision and a hallway flash.
Nightmare BB charges when you look directly at him for more than 2 seconds, so eye contact is the trigger.
He replaces all lighting with a pulsing red glow during the nightmare sequence.
He cannot turn corners while frozen, which is the opening that lets you reposition.
He is one of the Mask Route nightmare sequence threats that layers a look rule on top of the normal survival loop.
He is the direct ancestor of Nightmarionne's even stricter sub-1-second glance rule.
Instinctively turning to face him is exactly the input that triggers the charge.
Players assume a glance is safe and hold it a beat too long.
Freezing him and then staying put throws away the only repositioning window.
The pulsing red light is a Nightmare BB signal, not a cosmetic effect.
Use peripheral vision, keep him at the edge of the screen, and flash the hallway to freeze him for 5 seconds.
He charges when you look directly at him for more than 2 seconds.
During the Mask Route nightmare sequence.
Not while frozen. The freeze is your window to reposition and break line of sight.