Not that different? PFT. But Roger listened intently, not only because was the complicated workings of this Floo system was fascinating, but because he wasn't looking to leave a limb behind because he didn't follow the instructions to the dot. Complicated, however, was not a strong enough word to describe the whole process.
But Roger was almost certain he understood it all. "Just to the other shop and back, right?" He took the bag of powder and pulled the strings open, before pinching the dust between his forefinger and thumb. Considering the dust for a second, he raised it and tossed it into the heath. Watching the green flames appear, he said the name of the other shop and stepped through.
Except the flames turned red after Roger stepped into them because Roger hadn't thrown the powder just right. Alarmed, he started to step out, reaching his uninjured arm out to Fred for help. "What's going on?!" He shouted.