Garai realises fire solidifies the rock; he pushes both hands out and the wall hardens, then sweeps a slab of it aside.

Panel 1: Garai (thought): And fire solidifies it... I see... (sparks fly from his hand on the wall)
Panel 2: (no dialogue) (Garai thrusts both hands forward)
Panel 3: [SFX: CLANK!] (a rock formation hardens against the blue)
Panel 4: [SFX: Stops] (his hands hold the stilled rock)
Panel 5: (no dialogue) (Garai raises one arm high)
Panel 6: [SFX: Swish] (a slab of rock swings aside in the cave)