From his vantage point at second base, Kelly Johnson went through the same sequence of emotions as nearly everyone else in Citi Field: disbelief that Ruben Tejada’s hit skipped past Domonic Brown, concern for Brown as he flipped over the outfield wall and onto the concrete below, then a blaze of excitement as he watched Tejada race around the bases for the Mets’ first inside-the-park home run in a half-decade.