For me, the distinction is as follows:
"The Professor looked intensely at he Wall of Commands and said 'let the water flow!' After a tense moment, the power of his voice triggered an incredible event not seen on this planet in living memory: the ancient floodgates creaked open slowly for the first time in centuries, and let the lake drain onto the parched plains below." <-- this is fantasy
"The Professor turned to compoint and said 'let the water flow!' His unique voiceprint finally woke up the Planet Guard put in place long ago to protect the citizens from themselves. The machine took a few second to process the unusual order, then opened the ancient floodgates for the first time in centuries, letting the lake drain onto the parched plains below." <-- this is science fiction.
The difference? science fiction tries to root futuristic- or magical-looking events in a plausible scientific or rational narrative, whereas fantasy just uses them to dazzle or enrich the plot without further explanation.
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