Judging from his expression, the bodyguard is wondering how he's gonna fit her into the porta-potty.
When photos surfaced on Rihanna's Instagram feed, some initially thought it was cocaine that she had laid out on her bodyguard's head, as the glare from the lights made the substance look white. But no, it was weed, possibly left over from an earlier encounter with Snoop Dogg where she was photographed smoking a blunt the length of an adolescent raccoon. We can follow the tragic sequence of events from here via more evidence provided by social media:
Following the Snoop affair, she waded into a crowd to "flaunt her abs," after which she climbed aboard our unfortunate victim, tweeting out "Here's my party spot!!!"
She became sad after tugging on his jaw and it didn't slide out like the cup holder in her car.
Then, surveying the lay of the land, she took advantage of the obvious opportunity before her, as the noise of the crowd presumably drowned out the whimpering of her mount while the extreme bedazzling on her shorts ground into his flesh.
Maybe she thought he was an actual table, on account of that glaucoma she's self-treating?
All in all, it certainly appears that a great time was had by some. In response to critics who voiced their concerns about the seemliness of the above behavior, Rihanna shot back with: "I'm crazy, and I don't pretend to be anything else." This seems a reasonable defense, in retrospect. After all, you'd probably exhibit some erratic behavior too if you'd been forced to spend the last few weeks promoting your supporting role in Battleship.