Reinstall Safari version 5
With you not having a Mac and with him having such an old OS, you probably aren't going to be able to remote in.

That said, even without a browser he should still be able to download Safari v5.0.6 which is the latest version supported by his OS.

Type the following commands into Terminal exactly as they appear, pressing Return after each one, and he should end up with Safari in his Downloads folder.

cd ~/Downloads
curl -O http://supportdownload.apple.com/download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/Mac_OS_X/downloads/041-5122.20110720.2HQcx/Safari5.0.6Leopard.dmg


(That's a capital O in the curl command.) It reports its size as 52.2 MB.

There is one big caveat, though - depending on what the Safari v7 installer did to his system, it may not work to reinstall v5, in which case he may need to reinstall the OS.