The San Diego Padres shocked baseball by adding Mason Miller at the trade deadline, and A.J. Preller opened up on why he decided to make the move.

The San Diego Padres were deemed as the co-best buyers with the Seattle Mariners at the trade deadline after the Mason Miller blockbuster.

Here is why that the Padres trading for Mason Miller left other teams in the MLB "pissed," which includes a certain prospect.