 Complete the following phrase:  One notable incident of the year was at the Monaco Grand Prix, where Senna outqualified Prost by 1.4 seconds and led for most of the race before crashing on lap 67. Instead of returning to the pit lane, Senna was so distressed by his own mistake that went back to his apartment and did not contact the team until he walked into the pit garage as they were packing up later that night. After team manager Jo Ramirez called him through his Monaco apartments cleaner hours after he had crashed, Senna was still devastated by his own mistake. As the television cameras had not captured his crash, team boss Ron Dennis did not know what had caused his DNF until then, though Prost speculated that judging from the tyre marks, it appeared as though Senna had clipped the inside barrier at Portier, which pitched him into the outside guard rail. At the 