When everyone is trying to figure out what the noise is, Ma-Ti's ring activates (not glowing to send him a signal, but emitting a beam by his controlling it as he always does by speaking) just before he says "Heart".
Zarm should not have been able to freeze time or teleport anybody since the only event that ever made him able to manipulate time was by cracking Gaia's crystal in "Summit to Save Earth: Part 1".