no tail vibration. im preety sure it had to do with food. i give them two separate bowls my male finished his and my female wasnt eating so my male started eating her's and she got mad (I think)
Maybe your female is just a "hot" female. A female born ate male temperatures can be very aggresive towards males. (not really sure how they act around females).
We've had things like this happen when a gecko gets too excited about food and what not and just lunges at anything that moves. It's hard to tell how to interpret things but since you said they were eating and there was no "tail vibrating" I would just try to keep a close eye on them and wouldn't worry too much.