Take the situation as an opportunity to communicate the Gospel.
There is no need to debate, because even if one were to win a debate empirically or rationally, such would be good for nothingness without faith in Christ.
The type of tomb was described in the Gospels, and the guarding of he tomb was documented in the Gospels. The penalty for a Roman soldier who allowed the object he was guarding to be taken illegitimately was death. Multiple guards fell asleep and a stone larger than could be moved by one man was moved to unseal the tomb. They were very cognizant of what had happened, to the point of going to the chief priests who then conspired to fabricate lies in an agreement where the priests would then defend them so they wouldn't be executed. (Matthew 28:11-15) Note, that the guards would fully admit to their seniors that they had fallen asleep at their posts,..a crime punishable by death, then they alleged Christ's followers had come and taken away the body, when all of his followers believed he was still in the grave and were in remorse, not realizing the meanings of the Prophecies (John 20:9). In addition, the priests were conspiring in a worldly fashion to retain worldly control of their religion(Matt 28:11-15). This is an important point, because today, just as then, those who will believe in Him through faith see clearly the truth, while those who deny Him, will prefer to follow worldly thinking.
Those who will be saved, will be saved purely by Him, by His grace, while those who reject Him, and seek to reject faith, are given that freedom in their volition.
Not only was the body gone from the tomb (Luke 24:1-5, Mark 16:1-7,John 20:1-10), Jesus Christ was seen for some 40 days along with many others who had been ressurrected. He was touchable and ate meat while in His resurrected body. His wounds were unique and touched by his disciples.(John 20:24-31)
He was the first fruits. He ascended to heaven in his resurrection body.
Prior to His crucifixion, Peter was prophecied to deny him three times before the cock crowed. Peter insisted this would never happen, as one of his closest disciples. While our Lord and Savior Christ Jesus was taken to the high priest, asked if He was indeed the Christ, Son of the Blessed, and our Lord responded "I am", and the high priest rent his clothes, shortly thereafter, Peter denied or Lord three times to avoid being associated with Him in public. (Mark 14:40-72)
Even his disciples didn't believe he had risen when first told of it. Instead they made first hand eyewitness testimony that He had indeed left the tomb.(Luke 24:10-12, Mark 16:6-11)
Later He was seen by them and they even touched His resurrected body. (Luke 24:34-53,
Particularly since "sealing" the tomb literally meant placing a wax seal bearing the emblem of the Roman Empire on the entrance to the tomb. Moving stone = breaking seal = high treason. Resurrection is a capital offense. No wonder the guards were eager to spread the falsehood that the disciples had stolen the body.