Very Sharp Fins cut through my wetsuit!

The waves were small today, 2-3ft but on my last wave of the day, I fell off backwards and some how the board turned to the side and the fin slid down my left inner arm, completely slashing open the wetsuit!
The fin barely grazed my arm and I saw blood. Thankfully, it was a 3 inch long - deep scratch that was bleeding, no stitches needed.
1. How can I make sure this never happens again?
2. Can I get some softer fins or should I get a foam board?
3. How can I repair my wetsuit.
At least it was the wetsuit and not my arm was split open.
(By the way, it took me forever to find a lifeguard to get a bandage, maybe a good idea to keep that in the car.)

The fin barely grazed my arm and I saw blood. Thankfully, it was a 3 inch long - deep scratch that was bleeding, no stitches needed.

1. How can I make sure this never happens again?
2. Can I get some softer fins or should I get a foam board?
3. How can I repair my wetsuit.
At least it was the wetsuit and not my arm was split open.
(By the way, it took me forever to find a lifeguard to get a bandage, maybe a good idea to keep that in the car.)