Having received his orders, Grav stopped picking the bits of meat and bone out of Daisy and lumbered towards the makeshift raft. However Grav had his worries, as an ogryn Grav wasn't the lightest thing in the galaxy and with the addition of his bionic arms he was slightly more heavy than he usually is. 

Turning towards the tech priest, Grav said "I fink I'm a little too big for dat der boat tech priest." to prove his point, Grav clapped his arms together and produced the tall tale clang of metal.