Winters directly stuffed the soft pouch through the slits of the door; he no longer used a powder fuse but instead fully unleashed a fire ignition spell.
Unlike the layer-by-layer ignition of the powder fuse, the fire ignition spell acted directly on the entire bag of black gunpowder. The black powder, having absorbed a massive amount of energy, breached its energy barrier and exploded instantaneously.
With a "boom," the powder pouch exploded violently, the iron nails bound to its exterior propelled by the burning gas of the gunpowder, shooting out in all directions.
An iron nail shot through the slit in the door, carving a bloody furrow over Winters' head. And inside the door, the situation had to be even grimmer—the screams of agony coming through the slit were evidence, and the force pushing against the door from the inside drastically diminished.
"On my command! All together, ram the door!"