Some of the most effective soldiers of years gone by were the Spartans. Contrary to many at the time who fought in formation, a method kept by many including the British for many years, the Spartans used a different methodology.
They would fight two by two; but not side by side as as that would leave the vulnerable backside open to attack, so they fought back to back so that the well protected armour side was always facin the opposing threat.
We also are called to go out two by two; "And he called unto him the twelve, and began to send them forth by two and two; and gave them power over unclean spirits;"- Mk 6:7 (Lk10:1). It is of the utmost importance when going in pairs that as soon as one engages in a witness with someone then the other is charged with protecting his partner's back, so that all of his/her attention can be given to delivering the message that the Lord has given you charge of.
You work as a team, just like the Spartans. "And if one prevail against him, two shall withstand him; and a threefold cord is not quickly broken."- Ecl 4:12. Not only are there the two of you, but there is also a third party in the mix, the Holy Spirit. It is important to be guided by the Holy Spirit before engaging in spiritual battle so that you know what target to engage, for in leaning to your own understanding you may be missing the soul that God wants you to reach.
It is not "spray and pray" when it comes to witnessing God's truth; that is a waste of time, manpower and could end you up entangled with someone sent along to take you away from doing what the Lord wants. Your enemy is spiritual but can take on physical attributes in weak vessels, who either willlingly or unwillingly yield themselves over to try to stand in the way. "Who goeth a warfare any time at his own charges?..." - 1Cor 9:7 Be led of the Spirit, not all are called to the kingdom. This has been born out in many instances in Scripture including by Jesus Himself: "And the disciples came, and said unto him, Why speakest thou unto them in parables? He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given." - Mt 13: 10-11 IT, IS, NOT, FOR, EVERYONE. Pick and chose, with the prayerful help of the Holy Spirit, and have each others' back.