The time to mourn clearly wasn't on the mind of Mister Joestar, which made Charlotte open her eyes, and look at him in surprise. The Englishman, turned-American, had a different idea, and the blonde started to wonder, if Speedwagon truly survived. The thought could only be answered by the culprit and, judging by his clenched fists, Sir Joseph was determined to know the verdict. Some kind of hunch told Charlotte that Robert was alive, and that he was walking around, as they speak. 
It was as if his words have ignited a fire inside the German girl, dawning upon Charlotte that she should not have run away, in the first place. The truth will come to light, once they find the man responsible. She nodded at his decision. "I'll join you", she finalized. 

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Later in the day, the two were on a bit of a stake-out. Funny enough, Joseph thought the very term was to actually get meat, which only brought amusement to the blonde and, to suit the joke, here they were, sitting in a restaurant, eating literal steak. Charlotte changed out of her red dress, and put on a more casual attire, donned with blue and white themes. If her instincts were right, then Straizo would be the one seeking Sir Joestar out. So, she had to convince the brown-haired man to be the bait (sort of).