He can hear Ignatius yell in frustration which only makes Strange swim faster. He hates this, but there's nothing he can do until he's on solid ground or at least out of the water. He manages to reach the surface and takes a few gasps of air before thrusting his hand down to point at the base of the coliseum and muttering a spell.

A different pillar of earth shoots through the water, directly under Strange. He's far enough away from Ignatius, Syrlya, and Rita that neither of them have to worry about it but surprise Lambert, now you get to deal with a whole bunch of earth. It pushes up through the water to give Strange a platform to stand on but big enough to hold one or two other people as well.