what turns a crowd into a mob? this is for reading

Often the fact that those in a crowd feel anonymous is what turns a crowd into a mob. They often feel that no one will point them out and notice what they are doing when there is a crowd.

Explanation: yes

what are the phrases to choose from?

(you didn't attach a copy of the poem, but i'm answering as best as i can)

since a simile compares two unlike things using like or as, it kind of gives an item the ability to do something it can't.

example: "the player was like a tiger on the field"

in this sentence, the simile conveys the idea that the player was fast and strong, like a tiger.