It reminds me of when I was younger, and my pastor went on a mission trip to the Philippines. He spoke through an interpreter and was there for about 3 weeks. In those 3 weeks he saw somewhere around 5,000 salvations. It was so strong the response that when he returned he said "People are so ready to get saved over there that you could say 'boo' and people would get saved."
I have an extreme problem with that statement. We cannot ever come to the point that we believe our message doesn't affect the response. "Faith comes by hearing and hearing by the Word of God." (Romans 10:17) Unless God's words are being communicating a person cannot believe those words. I do not wish to demean the labors of these two brothers however I use their labors illustratively to ask, whose words are you communicating with a dying world? Your words or God's? Who's message? May we be found faithful to what God has said and intended in the Bible. And may we never confuse "raised hands" with understanding the gospel.