So there's a story out there very similar about when Bishop Mendez ordained Fathers Greenwell and Baumberger.
When he got to the essential form, Bishop Mendez sped up and started garbling the words to the point that the priests there could not verify that he said it correctly. So they asked him to repeat it. Finally, Bishop Kelly asked Father Zapp, "Did he get it right that time?" to which he responded, "I think so."
http://www.fathercekada.com/2001/09/11/bp-mendez-sspv-and-hypocrisy/Didn’t Bp. Mendez show he was a traditionalist by ordaining two priests for SSPV in September 1990?
-Had no wish to be identified publicly as traditional Catholic or even associated with ceremony.
-Arrived, as usual, in lay clothes.
-Performed ordination ceremony in secret.
-Followed Novus Ordo rules and did not ordain candidates to subdiaconate before. (Subdiaconate is when seminarians take on celibacy obligation.)
-Refused to wear all the traditional vestments.
-Insisted ceremony not be videotaped: “Get that thing out of here!”
-When he arrived at Preface of Ordination, which contains the essential sacramental form, suddenly began racing through it so quickly that it was incomprehensible.
-Became angry when asked to repeat essential part.
-Then repeated it in way that prompted following exchange: Fr. Kelly: “Did he get it right that time?” Fr. Thomas Zapp: “I think so.”
-Ceremony continued on basis of “Think so.”
-Fr. Zapp says he cannot vouch for certain that Mendez finally said essential words properly.
-Bishop’s conduct during ceremony was such that afterwards in sacristy Fr. Kelly shook his head, told Fr. Zapp: “Never again. I’ll never do this again.”
-Mendez used a false name to disassociate himself from ordination: “Bishop Francis Gonzalez.”
-Lied and denied in writing that he performed ordination, calling it “an ugly rumor.” (Letter to Fr. Scott, 17 October 1990)