It's bullying & a really stupid idea if it's intended to help the boy get over his fear of water. Some years ago, my then 4-year-old grandson was afraid of the water. We sat at the shallow end of my pool & I splashed his knees. He giggled & splashed me back. I went down a step & splashed his knees again. Now he had to get down to the same step to splash me. I scooched down to the last step, & splashed his knees on more time, then I stood up. He stood up on the bottom step - the water was now up to his thighs - & splashed my chest. I laughed & leaned forward & held out my arms. He put his arms around my neck & I waded forward, gently splashing his back. He leaned sideways into the water & scooped up a handful & splashed my face. I laughed, he laughed, & then I held him up & away from me. By then he was in up to his chest. I walked around while he kicked his feet & let him discover for himself that he was almost swimming. After awhile my arms were getting tired so I walked him back to the steps & let him climb out on his own. I swam out to the middle of the pool. He followed me around outside the water & then, with no warning, he jumped in on top of me. I managed to keep his head above the surface but not my own. Luckily his mom was there & swam over & hauled him off me before I drowned. He was obviously no longer afraid of the water. I taught him how to float on his back &, with a little support, how to dog-paddle (really more of a dog-flail). His mom got him real swimming lessons later. The trick with a fearful young child is to be gentle & let him set his own limits.