Engage in early duel with an Agent on Answer The Phone level
While playing as Ghost on the city rooftops, after evading the many gaps and climbing the ladders, the Agent that burst through the door drops down to destroy you. If you choose to hide behind the left wall and attempt to fire off rounds from around the corner at this Agent, he will unsurprisingly dodge every bullet. If you Focus, you can jump over the gap between you and the Agent, and will be able to engage in hand-to-hand combat. However, at this point it is extremely hard to win; so continue to jump across to your left. Fall down into the lower area. Now, rather than taking the cop out and running up the stairs, dispatch the cop(s), but wait around long enough to see the Agent. If he fires at you, then Focus and bullet dodge to get close to him. You now have enough space to fully challenge this Agent without being closed in. Battling an Agent is more intense (and hard) than taking on any groups of police or SWATs, because they can avoid all bullets and have shattering strength. You will have to Focus almost all of the time in order to knock him down, and inevitably you will soon find yourself on the brink of death. Run up the stairs and to the phone if low on health. Note: Although you cannot fully destroy the Agent, you can momentarily defeat one until it moves into another body. This would seem impossible, but it is possible. Going back to the point where you climb up the ladder and the Agent first drops down, rather than waiting for the Agent to land, climb up the ladder. Before you even see the Agent, start running and use your Focus to jump to the platform where the Agent lands. Still holding Focus, move behind his position where he lands. Start kicking him, and as he is off guard, he is very unlikely to counter. If you kick him enough, you should be able to knock him off the edge of the "platform" and down the gap, causing the Agent to plummet to his death. Thus, you have momentarily defeated an Agent. Note: If you should ever face Agent Smith, you would be wise not to underestimate him, he is the most skilled Agent.