He shook his head, frustrated.
Instead of waving away suggestions that his campaign may have colluded with Russian actors to influence the 2016 election, he has had the matter hanging over his head, frustrating him to no end.
Head was frustrated that he couldn't make the software work when asked to review a journal article.
Second-placed Dortmund were heading for a frustrating draw when Aubameyang headed home Lukasz Piszczek's cross.
The hosts were heading for a frustrating draw when Balotelli scored from 25-yards four minutes from time.
It was a spiky occasion and one which, for all the relief of victory, will have left the head coach privately frustrated.
Claressa built up momentum each round, unleashing a flurry of combinations and deft head movements that frustrated her Russian opponent, Nadezda Torlopova, a world champion nearly twice her age.
Cardiff's captain, Sam Hobbs, was yellow-carded but Sean Maitland dropped the ball when he looked certain to cross and Niko Matawalu's try was disallowed, leaving the Glasgow head coach, Gregor Townsend, frustrated.
That short turnaround has left head coach Wayne Pivac frustrated as he tries to manage his squad while juggling injuries, a situation that he unsuccessfully attempted to address with tournament organisers.
On Tuesday, they settled in with calm professionalism, impeccable communication and timely interventions, cutting out passes, heading balls to safety, frustrating both the darting craftiness of the Manchester United striker Javier Hernández, known as Chicharito, and the 100,000 fans who jammed into the Azteca.
