We took a video of our puppy tearing open Christmas presents.
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means tear so the verb version is to tear.
You start to tear the cloth. You don't know if you're supposed to or not. The crowd isn't sure either. You hear kind of a yah boo (やぶ) reaction going on, making you unsure if you should continue or stop. Yah! Boo. Yah! Boo!