Sorry about that lower unit. They get a bit pricey. What area were you fishing when this happened?
The only suprise I had last year was on the Maggies stretch. I fish the area quite a bit and never had a problem but back in the corner on the Northern, upstream side of Bittersweet bridge there appears to be a pipe coming up high enough to contact a prop. I hit this at idle in 7' of water and dinged all 4 blades on the Trophy. Been in that corner countless times and never had a problem.