Wait, how did Rectina send the message that said she was trapped at the foot of the mountain, if she was… trapped at the foot of the mountain in her house? Why didn’t she escape with the messenger?
Although the sentence says "... except by boat". Why she sent a messenger (presumably by boat) to ask Pliny the Elder to pick her up, instead of using that boat itself, is, curious.
Edit: https://igppweb.ucsd.edu/~gabi/sio15/lectures/volcanoes/plin...