Let's say for example that the second tRNA that lands next to the methionine-tRNA is for leucine. What happens next is crucial for the building of proteins. In order for a protein chain to form, the amino acids must be attached, linked together.
Amino acids continue to be linked until the protein is finished.
Once the bond has formed between the two amino acids, the tRNA on the P site leaves and passes its amino acid on to the tRNA on the A site. The ribosome slides down another codon and the procedure repeats itself until the termination event occurs.