Here's why:
* Participial phrase: A participial phrase is a group of words that acts like an adjective, modifying a noun or pronoun. It begins with a participle (a verb form ending in -ing or -ed) and includes any related words (objects, modifiers).
* Participle: In this case, the participle is "Charging."
* Modification: The phrase "Charging at the red cloak" modifies the noun "bull," telling us what the bull was doing.
Let me know if you'd like more examples!