Welp, didn't expect THAT ending.
No kidding!! Is this the year of the TIE? First, Cleveland and Pittsburgh; then Green Bay and Minnesota; NOW, Reigns and Strowman.
Since when do Hell in a Cell Matches end in no contest/draws?
This match is designed to settle the scores, once and for all. Outside interference is no reason to stop a match (i.e. the FIRST HIAC match with 'Taker and Michaels).
If anything, Lesnar should have beat up both guys and thrown Reigns' limp body onto Strowman for the pin.
Not to mention that, tapout-pin thing with AJ Styles and Samoa Joe. That was shades of Undertaker-Kurt Angle in 2002 (only that match was ruled a draw, when Angle put the Deadman in a triangle choke; but Taker rolled up Angle for the pin. Taker tapped at the same time the ref's hand hit the mat the third time).
As it is, the Monster becomes the fourth guy to FAIL to win a title after an MITB cash-in.