Landing next to the base and not attacking it but an enemy unit.

[Tripwire]

You're thinking way too much about a simple game like this.

I attack a unit if it's in a position to threaten a crucial unit of mine or if losing the unit hurts my opponent more than 1 hp of his base.

I attack his base if I know I can kill it and need that 1 hp off. Just won a game where I do both actually. Just need my opponent to surrender, then I'll post a replay link.

He surrendered. Replay

I won the game on turn 6 already, btw.