in a bubble

English as a Second Language English Vocabulary, Grammar and Idioms
1

(…)a lawyer acting for Anders Behring Breivik,(…) portrayed his client as a drug user “in a bubble.”
…
“He believes that he is in a war and in a war you can do things like that,” Mr. Lippestad said.
“He is in a bubble,” Mr. Lippestad said, adding that Mr. Breivik took drugs to “be strong, to be efficient, to be awake.” The lawyer did not say which drugs his client had used.

  • “In a bubble” here, means ‘totally inside his own world’?
    Thank you.
2

Yes, I believe that is what they are referring to here. Nice work.

“Inside his own little world”
“Lives inside a bubble”
“lives in his own world”