Kog'Maw has no mobility at all, so he can't escape Tristana's all-in: Rocket Jump (W) in, detonate the Explosive Charge (E) stacks, and Buster Shot (R) back out.

Twitch has short range and no mobility, so Tristana, whose range grows each level with Draw a Bead (P), pokes him one-sidedly throughout the lane and detonates with Explosive Charge (E).

Vayne is short-ranged and scaling early, so Tristana pokes with her Draw a Bead (P) range lead and crushes her with a Rocket Jump (W) + Explosive Charge (E) all-in before she scales.

Nilah is melee-ranged, so Tristana kites by creating distance with Rocket Jump (W) and shuts down her approach with Explosive Charge (E) poke.

Samira is a melee all-in champion, so Tristana breaks her combo and retreats with Rocket Jump (W), keeping her from stacking damage and Inferno Trigger (R) charge.

Caitlyn massively outranges Tristana, chipping her health with poke before she can close, and her Yordle Snap Trap (W) punishes Rocket Jump (W) landing spots.

Draven's early Spinning Axe (Q) damage is explosive, so a weak level 1-3 Tristana loses close-range trades and gives up the lane.

Lucian's Lightslinger (P) double shots and Relentless Pursuit (E) dash give him strong short-trade damage, continuously pressuring a squishy early Tristana.

Miss Fortune's bouncing Double Up (Q) and Strut (W) movement speed make her lane poke strong, continuously chipping Tristana's health before she gains her range.