Also, earlier in the episode, or the previous one, Noah says the exact same phrase, "I get it now", when referring to Dawn as she seeks weak people to serve under her. Later on, Dawn tells Beth "I thought you were weak, but you're not", after she learns of Beth's escape attempt. She gladly gives up Beth as an exchange because she doesn't want someone stronger than her. Dawn feels threatened by Beth's strength. When Beth says "I get it now", and attacks it's probably because she knows Noah will be badly mistreated again and is protecting him.