I like waiting for several bigger aliens to rush one side of H-base so I can camp at the opposite human exit (preferably with a line of sight on the base's interior.) Then, as the onslaught begins, either...
A.) My team's rush is effective, causing the defending humans to turn their backs on my entrance and allowing me to sneak in and snag a few scared naked frags while they desperately unload their MG clips at far more distracting targets.
OR
B.) My team's rush fails and I switch to field medic-mode, quickly healing a few retreating teammates (who will more than likely make their escape through my exit and not the one they came in, because that's just asking for it usually) just in time for them to turn back and ambush their would-be attackers as they come charging out after us.
One good thing about scenario A is that distracted humans make the best test-dummies for your Basi to practice on.
:basilisk:
Pimp Daddy Bassi says...
"Don't you EVER look at me when I'm grabbin' you!"