User blog comment:ReverseZoom101/Weird things in yesterday's Flash episode!/@comment-20053828-20160423231719/@comment-3423279-20160424202256

Because Barry doesn't have any control over that power to breach universes, why bring it up if you have no idea how you did so.

Plus if he did that it would cause him to be stranded on Earth 2 considering he would need another extremely fast individual to get back. Zoom would be slightly less willing to help Barry get back to Earth 1 than Supergirl was.

Cisco has seen what he could become with the power he has and is allowed to be afraid after seeing Reverb. Cisco opening the breaches is also their best bet if they want to go between Earth One and Earth Two considering the above reason.

How does Barry know that he can beat Zoom before Zoom kills one of his friends? He doesn't and while Barry did something idiotic by giving Zoom his speed he is a hero, heroes always do something stupid.