he turned to adam , who gave him a crooked smile and said , `` hold tight , '' and then , right then , he flashed back more than a decade , when adam was four and they were at this same park and there was a crush of people entering the stuntman show , a total crush , and mike held his son 's hand and told him to `` hold tight , '' and he could feel the little hand dig into his but the crush got bigger and the little hand slipped from his and mike felt that horrible panic , as if a wave hit them at the beach and it was washing his baby out with the tide .