Another instance when we were at risk for loss of control occurred back when we had a Cessna 340. We were over Klamath Falls, Oregon, on our way back home to San Diego. We had put a friend in the left front seat and I was acting as his flight instructor. We were on an instrument flight at 11,000 feet when we flew into the top of a developing cumulus cloud. Instantly, the airplane was coated with ice. It was clear we were collecting ice at a rate that even this full-deicing-equipped twin couldn't handle. I looked down to get a sectional chart to check for a descent path. When I looked up, I saw that we were losing altitude. "Hold your altitude," I warned our friend. When he pulled back on the wheel to return to altitude, the airplane immediately entered a stall buffet. I took control, called ATC for descent, simultaneously applied full power, and pitched down to best rate of climb speed. This caused us to enter a thousand-feet-per-minute rate of descent, which continued until we were below the freezing level and shed the ice. When we had a chance to reflect on what happened, we realized that this was yet another scenario that was a setup for loss of control.