Why does the human blood look colorless in this scene?

Question

In Bumblebee (2018), one of the Decepticons shot the human with their gun, causing the human to explode into what looked like colorless blood:

Why does the human blood look colorless?

Answer 1

It's because this film has a lower age rating than the previous Transformers films, entitling young children to see it.

The MPAA rated this film as

PG-13 for sequences of sci-fi action violence

From Wikipedia:

Depictions of violence are permitted under all ratings but must be moderated for the lower ones. Violence must be kept to a minimum in G rated films and must not be intense in PG rated films. Depictions of intense violence are permitted under the PG-13 rating, but violence that is both realistic and extreme or persistent will generally require at least an R rating.

So, using "sci-fi" weapons to reduce someone to a harmless looking gloop allows the film to retain the intended PG13 rating.