One possibility: If the employee is fired other than for cause (crime, fraud, etc.), then the employer will pay the employee a pro-rated bonus at the same time

One possibility: If the employee is fired other than for cause (crime, fraud, etc.), then the employer will pay the employee a pro-rated bonus at the same time other employees get their bonuses. This is sometimes negotiated in executive employment agreements, but I can't say I've seen it in rank-and-file agreements.