#4 Styles begs Undertaker to not "bury him"
During the middle part of the match, The Undertaker pushed AJ Styles into the grave, but couldn't bury him. The other two members of The OC, Karl Anderson and Luke Gallows, came to the aid of Styles, along with a few hooded druids. The Undertaker brushed aside the hooded men, and then attacked Gallows and Anderson with a shovel.
Styles appeared and attacked Undertaker from behind with a block of stone, before telling Undertaker that he does not have what it takes to "bury him". But, during the final moments of the match, The Undertaker tells Styles that he will not last as long as he did, alluding to The Undertaker's storied and lengthy career. This is when Styles pleads the Undertaker to not bury him many times and apologizes to him.
Undertaker hugs Styles and told him that he "fought his a*s off" and it seemed like 'Taker would let Styles live another day, but he landed a big boot to put Styles in the grave and bury him.
Styles begging Undertaker to not "bury him" perhaps had two different meanings; burying him in the grave, and "burying" Styles' career with a huge loss at WrestleMania.