Lol? He can block it with haki
Jinbe used water against projectile magma and still got burnt
But yeah this is on guard and against a simple attack from Akainu, not Daifunka tier
Nothing in the verse can produce better results than this
If I were to rank the 5 worst attacks to take in
1. Magma fist
2. Ice Time -when Kuzan freezes on contact-
3. Magellan's poison
4. Fullpower Gura
5. High end sword attacks