<p>I watched black-bullet and read the light novel quite some time ago. But just recently watched it again because I got bored.</p>
<p>Something got to my mind all of a sudden after episode 4, Why is the Tricycle the catalyst for a stage 5 Gastrea?</p>
<p>I looked around on the wiki etc, but couldn't really find it. But I have my speculations, like if the human soul or something remains a little and this is used as a triggering factor for a lot of emotions that it would form an stage 5 or something.</p>
<p>Nevertheless, I'm really interested if I missed it and there is an actual mention of this or other's speculations.</p>

CC BY-SA 3.0
2017-12-26T12:36:32.427Z
Well gastrea were humans. Maybe that tricycle was the lv 5 Gastrea's tricycle when she was human.
絢瀬絵里
CC BY-SA 3.0
2017-12-26T19:46:37.017Z
@絢瀬絵里 exactly what i thought but u dont know if theres a mention about this ?
H. Brendan
<black-bullet>
Why is the Tricycle the catalyst?
# Why is the Tricycle the catalyst?
Posted by: username_0 on 2017-12-25
I watched black-bullet and read the light novel quite some time ago. But just recently watched it again because I got bored.

Something got to my mind all of a sudden after episode 4, Why is the Tricycle the catalyst for a stage 5 Gastrea?

I looked around on the wiki etc, but couldn't really find it. But I have my speculations, like if the human soul or something remains a little and this is used as a triggering factor for a lot of emotions that it would form an stage 5 or something.

Nevertheless, I'm really interested if I missed it and there is an actual mention of this or other's speculations.
**Tags:** black-bullet
> **Comments:**
> **username_1**: Well gastrea were humans. Maybe that tricycle was the lv 5 Gastrea's tricycle when she was human.  
> **username_0**: @絢瀬絵里 exactly what i thought but u dont know if theres a mention about this ?  
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## 0 answers
